<img align="middle" alt="begin mathsize 14px style U subscript n end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«msub»«mi»U«/mi»«mi»n«/mi»«/msub»«/mstyle»«/math»" height="15" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -5px;" width="18" />&nbsp;pada soal adalah barisan aritmetika yang telah diketahui rumusnya.

<img align="middle" alt="begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n squared minus 9 end cell equals 0 row cell left parenthesis n plus 3 right parenthesis left parenthesis n minus 3 right parenthesis end cell equals 0 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 left¨»«mtr»«mtd»«msup»«mi»n«/mi»«mn»2«/mn»«/msup»«mo»-«/mo»«mn»9«/mn»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»0«/mn»«/mtd»«/mtr»«mtr»«mtd»«mo»(«/mo»«mi»n«/mi»«mo»+«/mo»«mn»3«/mn»«mo»)«/mo»«mo»(«/mo»«mi»n«/mi»«mo»-«/mo»«mn»3«/mn»«mo»)«/mo»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»0«/mn»«/mtd»«/mtr»«/mtable»«/mstyle»«/math»" height="36" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -19px;" width="112" />&nbsp;

<img align="middle" alt="begin mathsize 14px style n equals negative 3 space text atau end text space n equals 3 end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»n«/mi»«mo»=«/mo»«mo»-«/mo»«mn»3«/mn»«mo»§#160;«/mo»«mtext»atau«/mtext»«mo»§#160;«/mo»«mi»n«/mi»«mo»=«/mo»«mn»3«/mn»«/mrow»«/mstyle»«/math»" height="11" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -1px;" width="122" />

Jadi nilai <img align="middle" alt="begin mathsize 14px style n end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi»n«/mi»«/mstyle»«/math»" height="8" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAICAYAAADA+m62AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAHXkAHPQAAAFlJREFUeNpjYECAG0BsDcQLgfgLEH8A4kQGNMAExH+A+CQQB0D5bkD8FF2hORBfA2JBJDGQ6XvRFUYC8XwixBgmAXEyEWIM64DYC01sAxYxhndAzEGEGGEAALwVEQzwRYXNAAAAanRFWHRNYXRoTUwAPG1hdGggeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzE5OTgvTWF0aC9NYXRoTUwiPjxtc3R5bGUgbWF0aHNpemU9IjE0cHgiPjxtaT5uPC9taT48L21zdHlsZT48L21hdGg+6GnXTQAAAABJRU5ErkJggg==" style="max-width: none; vertical-align: -1px;" width="10" />&nbsp;pada barisan tersebut&nbsp;adalah&nbsp;&nbsp;<img align="middle" alt="begin mathsize 14px style n equals negative 3 space text atau end text space n equals 3 end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»n«/mi»«mo»=«/mo»«mo»-«/mo»«mn»3«/mn»«mo»§#160;«/mo»«mtext»atau«/mtext»«mo»§#160;«/mo»«mi»n«/mi»«mo»=«/mo»«mn»3«/mn»«/mrow»«/mstyle»«/math»" height="11" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -1px;" width="122" />.

Hitunglah <img align="middle" alt="begin mathsize 14px style n end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi»n«/mi»«/mstyle»«/math»" height="8" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAICAYAAADA+m62AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAHXkAHPQAAAFlJREFUeNpjYECAG0BsDcQLgfgLEH8A4kQGNMAExH+A+CQQB0D5bkD8FF2hORBfA2JBJDGQ6XvRFUYC8XwixBgmAXEyEWIM64DYC01sAxYxhndAzEGEGGEAALwVEQzwRYXNAAAAanRFWHRNYXRoTUwAPG1hdGggeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzE5OTgvTWF0aC9NYXRoTUwiPjxtc3R5bGUgbWF0aHNpemU9IjE0cHgiPjxtaT5uPC9taT48L21zdHlsZT48L21hdGg+6GnXTQAAAABJRU5ErkJggg==" style="max-width: none; vertical-align: -1px;" width="10" />&nbsp;dari barisan berikut, jika ...

a)&nbsp;<img align="middle" alt="begin mathsize 14px style U subscript n equals n squared minus 9 equals 0 end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«msub»«mi»U«/mi»«mi»n«/mi»«/msub»«mo»=«/mo»«msup»«mi»n«/mi»«mn»2«/mn»«/msup»«mo»-«/mo»«mn»9«/mn»«mo»=«/mo»«mn»0«/mn»«/mrow»«/mstyle»«/math»" height="19" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -5px;" width="98" />&nbsp;

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