Dengan menggunakan cara mencari nilai fungsi dan penjumlahan dua fungsi diperoleh:

<img align="middle" alt="begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f open parentheses x plus 1 close parentheses plus g open parentheses x plus 1 close parentheses end cell equals cell open parentheses 2 open parentheses x plus 1 close parentheses minus 3 close parentheses plus open parentheses open parentheses x plus 1 close parentheses open parentheses open parentheses x plus 1 close parentheses plus 2 close parentheses close parentheses end cell row blank equals cell open parentheses 2 x plus 2 minus 3 close parentheses plus open parentheses open parentheses x plus 1 close parentheses open parentheses x plus 3 close parentheses close parentheses end cell row blank equals cell open parentheses 2 x minus 1 close parentheses plus open parentheses x squared plus 4 x plus 3 close parentheses end cell row blank equals cell x squared plus 2 x plus 4 x minus 1 plus 3 end cell row blank equals cell x squared plus 6 x plus 2 end cell end table end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mtable columnspacing=¨0px¨ columnalign=¨right center 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height="99" role="math" 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style="max-width: none; vertical-align: -50px;" width="369" />

Dengan demikian hasil dari&nbsp;<img align="middle" alt="begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank f end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell left parenthesis x plus 1 right parenthesis end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank g end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell left parenthesis x plus 1 right parenthesis end cell end table end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mi»f«/mi»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mo»(«/mo»«mi»x«/mi»«mo»+«/mo»«mn»1«/mn»«mo»)«/mo»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mo»+«/mo»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mi»g«/mi»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mo»(«/mo»«mi»x«/mi»«mo»+«/mo»«mn»1«/mn»«mo»)«/mo»«/mtd»«/mtr»«/mtable»«/mrow»«/mstyle»«/math»" height="15" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHYAAAAPCAYAAAAxijsYAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAMyZLetQAAAfhJREFUeNpjYCAeVAJxNcPgAZVQPFB2D7mwUAPiSUDcBcSiUDE/IF7OMPjAUqjb6AmGZFiIA/FdIE4E4iAgtgViFqiYMBUd8Z9IdaBEVgvEF3DIg9x0C4jZqGQfITBkw6IIiJvRxJKhOZhhADyzGJrI8KmfBHUjPSJ2yIbFKiAOQBNbA8Q+A+QZYtT7QN1Ij4gdkmGxDaoJhH8gib8EYh4shmwAYkskviAQ7wZiSTp7hguIX1PJPlDAHAXib9CSC1S0yQ71sADVH1+wKP6DwxBpID4DxEzQch2UUlTwOIYQpsTzv6hgXx60xBKG+qcLLYEP1bAAp7i9JEQsCJRD8XwgNhig4gerZ0jUD2r9P0RreIDCY/9wCItIqKPQwXMg5sNhiBLUs/YDWK/wQItISuwLx+J3UHgsHA5hgatFhavBIAqtj0CB0jjEG0+hQDwFTQzEzxgOYbEOiL2IbOLzQBsHOlD+bCA2HSDPTIF2AyixTx6Ij0P9JQhtOL3EEh5DMizeATEHFsVs0NahMBJ/CxBbo3WOT+LQT2lXAF/DAjSgcoOIAQpiAGhA5jG0ro2Fti45hnpYiBKop0bakCKo23B4qIdFDnSYjNCg9kAOumMDtdBWKKVAA4inIfU5WaDFqeNQDws2pPphJAIeaL35BTowcRCI3Ya6pwCjlckMmEj5PgAAAuV0RVh0TWF0aE1MADxtYXRoIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8xOTk4L01hdGgvTWF0aE1MIj48bXN0eWxlIG1hdGhzaXplPSIxNHB4Ij48bXRhYmxlIGNvbHVtbmFsaWduPSJyaWdodCBjZW50ZXIgbGVmdCIgY29sdW1uc3BhY2luZz0iMHB4Ij48bXRyPjxtdGQvPjxtdGQvPjxtdGQ+PG1pPmY8L21pPjwvbXRkPjwvbXRyPjwvbXRhYmxlPjxtdGFibGUgY29sdW1uYWxpZ249InJpZ2h0IGNlbnRlciBsZWZ0IiBjb2x1bW5zcGFjaW5nPSIwcHgiPjxtdHI+PG10ZC8+PG10ZC8+PG10ZD48bW8+KDwvbW8+PG1pPng8L21pPjxtbz4rPC9tbz48bW4+MTwvbW4+PG1vPik8L21vPjwvbXRkPjwvbXRyPjwvbXRhYmxlPjxtdGFibGUgY29sdW1uYWxpZ249InJpZ2h0IGNlbnRlciBsZWZ0IiBjb2x1bW5zcGFjaW5nPSIwcHgiPjxtdHI+PG10ZC8+PG10ZC8+PG10ZD48bW8+KzwvbW8+PC9tdGQ+PC9tdHI+PC9tdGFibGU+PG10YWJsZSBjb2x1bW5hbGlnbj0icmlnaHQgY2VudGVyIGxlZnQiIGNvbHVtbnNwYWNpbmc9IjBweCI+PG10cj48bXRkLz48bXRkLz48bXRkPjxtaT5nPC9taT48L210ZD48L210cj48L210YWJsZT48bXRhYmxlIGNvbHVtbmFsaWduPSJyaWdodCBjZW50ZXIgbGVmdCIgY29sdW1uc3BhY2luZz0iMHB4Ij48bXRyPjxtdGQvPjxtdGQvPjxtdGQ+PG1vPig8L21vPjxtaT54PC9taT48bW8+KzwvbW8+PG1uPjE8L21uPjxtbz4pPC9tbz48L210ZD48L210cj48L210YWJsZT48L21zdHlsZT48L21hdGg+bKDqmAAAAABJRU5ErkJggg==" style="max-width: none; vertical-align: -3px;" width="118" />&nbsp;adalah&nbsp;<img align="middle" alt="Error converting from MathML to accessible text." class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mi»x«/mi»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«sup»«mn»2«/mn»«/sup»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mo»+«/mo»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mn»6«/mn»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mi»x«/mi»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mo»+«/mo»«/mtd»«/mtr»«/mtable»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd/»«mtd/»«mtd»«mn»2«/mn»«/mtd»«/mtr»«/mtable»«/mrow»«/mstyle»«/math»" height="14" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEYAAAAOCAYAAACSJWqFAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAANvpXuIwAAAX5JREFUeNpjYCANZAHxJyB+DMQ+DKMADrqAmA2IbYH46WhwYAIWIP4xGgyYIAeI+wio+U+EOcJQc0Cp7xcQHwdiLyq5kZD9oKLgMNReED0NiHkosdARiDdBUw0lDgM5Yj80W4IAExC7APEOOgXMFiC2h9oLAslAvIZcy9SgBrJRwWH10MKcVuA/iepBAfQNm8QGILZE4gsC8W4glkQS2w8NHGo47BwQSxNhDjHuokbAyAPxXWwSIEeegYYcGzRZqWCxDBnjk/tPQP03aHlyAcpeBcR6ZLqLHPvRAah4CMAlWQ7F84HYgMZJ+Q8Qr0NKgZLQ1BFAJXcRm2JAZd1SIPbDp0gJ6mB7OuTxl1gKcFA2uU8ldxETMOJAvBxHCoQDUSA+CsThQNxIh4BZCM3XyIALmm2o4S5C9gtCU6wgoeQEKtB0oPzZQGxK44DRgrYftJBibym0yqaGu4gpU3TwKWCDVsHWaA2vk0DMQeOGoim0pvsGjT0DOrqLnAJ6FAAATT5vJ0S3uJQAAAOLdEVYdE1hdGhNTAA8bWF0aCB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMTk5OC9NYXRoL01hdGhNTCI+PG1zdHlsZSBtYXRoc2l6ZT0iMTRweCI+PG10YWJsZSBjb2x1bW5hbGlnbj0icmlnaHQgY2VudGVyIGxlZnQiIGNvbHVtbnNwYWNpbmc9IjBweCI+PG10cj48bXRkLz48bXRkLz48bXRkPjxtaT54PC9taT48L210ZD48L210cj48L210YWJsZT48bXRhYmxlIGNvbHVtbmFsaWduPSJyaWdodCBjZW50ZXIgbGVmdCIgY29sdW1uc3BhY2luZz0iMHB4Ij48bXRyPjxtdGQvPjxtdGQvPjxtdGQ+PG1zdXA+PG1yb3cvPjxtbj4yPC9tbj48L21zdXA+PC9tdGQ+PC9tdHI+PC9tdGFibGU+PG10YWJsZSBjb2x1bW5hbGlnbj0icmlnaHQgY2VudGVyIGxlZnQiIGNvbHVtbnNwYWNpbmc9IjBweCI+PG10cj48bXRkLz48bXRkLz48bXRkPjxtbz4rPC9tbz48L210ZD48L210cj48L210YWJsZT48bXRhYmxlIGNvbHVtbmFsaWduPSJyaWdodCBjZW50ZXIgbGVmdCIgY29sdW1uc3BhY2luZz0iMHB4Ij48bXRyPjxtdGQvPjxtdGQvPjxtdGQ+PG1uPjY8L21uPjwvbXRkPjwvbXRyPjwvbXRhYmxlPjxtdGFibGUgY29sdW1uYWxpZ249InJpZ2h0IGNlbnRlciBsZWZ0IiBjb2x1bW5zcGFjaW5nPSIwcHgiPjxtdHI+PG10ZC8+PG10ZC8+PG10ZD48bWk+eDwvbWk+PC9tdGQ+PC9tdHI+PC9tdGFibGU+PG10YWJsZSBjb2x1bW5hbGlnbj0icmlnaHQgY2VudGVyIGxlZnQiIGNvbHVtbnNwYWNpbmc9IjBweCI+PG10cj48bXRkLz48bXRkLz48bXRkPjxtbz4rPC9tbz48L210ZD48L210cj48L210YWJsZT48bXRhYmxlIGNvbHVtbmFsaWduPSJyaWdodCBjZW50ZXIgbGVmdCIgY29sdW1uc3BhY2luZz0iMHB4Ij48bXRyPjxtdGQvPjxtdGQvPjxtdGQ+PG1uPjI8L21uPjwvbXRkPjwvbXRyPjwvbXRhYmxlPjwvbXN0eWxlPjwvbWF0aD7vNfGFAAAAAElFTkSuQmCC" style="max-width: none; vertical-align: -1px;" width="70" />.

Diketahui&nbsp;<img align="middle" alt="begin mathsize 14px style f open parentheses x close parentheses equals 2 x minus 3 end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»f«/mi»«mfenced»«mi»x«/mi»«/mfenced»«mo»=«/mo»«mn»2«/mn»«mi»x«/mi»«mo»-«/mo»«mn»3«/mn»«/mrow»«/mstyle»«/math»" height="15" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -3px;" width="85" />&nbsp;dan&nbsp;<img align="middle" alt="begin mathsize 14px style g open parentheses x close parentheses equals x open parentheses x plus 2 close parentheses end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»g«/mi»«mfenced»«mi»x«/mi»«/mfenced»«mo»=«/mo»«mi»x«/mi»«mfenced»«mrow»«mi»x«/mi»«mo»+«/mo»«mn»2«/mn»«/mrow»«/mfenced»«/mrow»«/mstyle»«/math»" height="15" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -3px;" width="100" />, tentukan nilai&nbsp;<img align="middle" alt="begin mathsize 14px style f open parentheses x plus 1 close parentheses plus g open parentheses x plus 1 close parentheses end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»f«/mi»«mfenced»«mrow»«mi»x«/mi»«mo»+«/mo»«mn»1«/mn»«/mrow»«/mfenced»«mo»+«/mo»«mi»g«/mi»«mfenced»«mrow»«mi»x«/mi»«mo»+«/mo»«mn»1«/mn»«/mrow»«/mfenced»«/mrow»«/mstyle»«/math»" height="15" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -3px;" width="120" />

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