Syarat domain fungsi rasional, yaitu penyebutnya tidak sama dengan 0. Dengan demikian:

<img align="middle" alt="begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 5 x plus 7 end cell not equal to 0 row cell 5 x end cell not equal to cell negative 7 end cell row x not equal to cell negative 7 over 5 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 left¨»«mtr»«mtd»«mn»5«/mn»«mi»x«/mi»«mo»+«/mo»«mn»7«/mn»«/mtd»«mtd»«mo»§#8800;«/mo»«/mtd»«mtd»«mn»0«/mn»«/mtd»«/mtr»«mtr»«mtd»«mn»5«/mn»«mi»x«/mi»«/mtd»«mtd»«mo»§#8800;«/mo»«/mtd»«mtd»«mo»-«/mo»«mn»7«/mn»«/mtd»«/mtr»«mtr»«mtd»«mi»x«/mi»«/mtd»«mtd»«mo»§#8800;«/mo»«/mtd»«mtd»«mo»-«/mo»«mfrac»«mn»7«/mn»«mn»5«/mn»«/mfrac»«/mtd»«/mtr»«/mtable»«/mstyle»«/math»" height="70" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -36px;" width="88" />

Sehingga, domain dari&nbsp;<img align="middle" alt="undefined" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»h«/mi»«mfenced»«mi»x«/mi»«/mfenced»«mo»=«/mo»«mfrac»«mn»1«/mn»«mrow»«mn»5«/mn»«mi»x«/mi»«mo»+«/mo»«mn»7«/mn»«/mrow»«/mfrac»«/mrow»«/mstyle»«/math»" height="30" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -11px;" width="95" />&nbsp;adalah&nbsp;<img align="middle" alt="begin mathsize 14px style open curly brackets x vertical line x not equal to negative 7 over 5 comma x element of straight real numbers close curly brackets end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mfenced open=¨{¨ close=¨}¨»«mrow»«mi»x«/mi»«mo»|«/mo»«mi»x«/mi»«mo»§#8800;«/mo»«mo»-«/mo»«mfrac»«mn»7«/mn»«mn»5«/mn»«/mfrac»«mo»,«/mo»«mi»x«/mi»«mo»§#8712;«/mo»«mi mathvariant=¨normal¨»§#8477;«/mi»«/mrow»«/mfenced»«/mstyle»«/math»" height="35" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAH8AAAAjCAYAAAC98dWfAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAWNPAnzwAAAxxJREFUeNrtXFGElFEUvpKRNSJJMg+RHjJGIisrWZGVlSTWyEoSyT5HekhWIsk+pLeVsbIiWUl66aGnlSXJSFakh7WSXrIPWSPqHPMNO//+/3/v+Wc0+5//fHzGmHvn/vd+955z7rlzx7nNqBEXnUETWM+qr1CFuEo8beOlCmPQtZJW6B7xto2VSrCud9MKNInDBR+kvwnMO45C30S0iNtskXShBIuYd7Cu675Zb+jGLeJ+RVbNxA/EIeK0Mpdm4gfiNXGniV88XFa26k18QXD0lbjHxO9zIznABPGp0m2sie/BM+K5AbR7lvicuIZtd9I48u7jYoST2Mub+D3i5wACPc6+fYKQ+1x6vqVOvOPaWbsZ4iNiA68PtIp/hLis0BcfJn4mDgWWr8MyjWOyMF4St2MCHNQmPgv+hXhMoS9uCN1MnPgzMPtXXfsgR6TLLuJKSoMviCOR8m9gokIakdTvfEcatzKkff3uZGn1OPE5TtlBfAULEIeVJKs555l9fBz4Hg9ZQmAiMS+S+lFwbn1WaHkGOXGkfW0Jn3Wj+OzjbxIXsEMZSWnnPHTuwpTzHPcBN8AG/K/U7IfW3wju5FLKbO7nNiiUro9jxfjRw8pvws9fIz4MDCyn4vzOhKfiAeIf4mhGnx9aP+9mX9rXxz34/Esw9Wxh7hNPevIXjbgPdnt8PvuKRTQ8nUF8SX1GGRHwiRwGcNK+dqL9ckafP4ptH0+At4gx4rAKnUUrtoyApYb37H+HBeJL6zOqgatm0HgCn95LX6P7/ErAPj8a8M0hrqi55OykeKtXglk5HrESS4gufd+TpX6ewKtprU99PYOJ9MulZ/hY/HewLh3x96KdBTzTpLYkz1ZFMyfPaeJnDDSTcB1Bl4mvRHyt+C/ir5v4xRXfmfgmfl4HqIWIed6FZyJNfEUYwl76A/GUiV9McLbuYxHEtxs7m8G/6FlW0A/W9XdaAbur1z746NzQ4cMZPpuvK+hX1XmSUXZL17krrv0bvhb8/QUl/eLj5dRjez5Q4JO9MbP2qsB6fnOe+/kMvp9m/8yhC7H/zPEP1RgFf8OpuPwAAAE6dEVYdE1hdGhNTAA8bWF0aCB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMTk5OC9NYXRoL01hdGhNTCI+PG1zdHlsZSBtYXRoc2l6ZT0iMTRweCI+PG1mZW5jZWQgY2xvc2U9In0iIG9wZW49InsiPjxtcm93PjxtaT54PC9taT48bW8+fDwvbW8+PG1pPng8L21pPjxtbz4mI3gyMjYwOzwvbW8+PG1vPi08L21vPjxtZnJhYz48bW4+NzwvbW4+PG1uPjU8L21uPjwvbWZyYWM+PG1vPiw8L21vPjxtaT54PC9taT48bW8+JiN4MjIwODs8L21vPjxtaSBtYXRodmFyaWFudD0ibm9ybWFsIj4mI3gyMTFEOzwvbWk+PC9tcm93PjwvbWZlbmNlZD48L21zdHlsZT48L21hdGg+zWyzcwAAAABJRU5ErkJggg==" style="max-width: none; vertical-align: -13px;" width="127" />.

Tentukan domain dari&nbsp;<img align="middle" alt="begin mathsize 14px style h open parentheses x close parentheses equals fraction numerator 1 over denominator 5 x plus 7 end fraction end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»h«/mi»«mfenced»«mi»x«/mi»«/mfenced»«mo»=«/mo»«mfrac»«mn»1«/mn»«mrow»«mn»5«/mn»«mi»x«/mi»«mo»+«/mo»«mn»7«/mn»«/mrow»«/mfrac»«/mrow»«/mstyle»«/math»" height="30" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAF8AAAAeCAYAAABKSMI8AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAATRJrTQAAAAhJJREFUeNrtmb1Lw0AYxoNIECkFKSLiIBQRBwcXEXFwEYdSRAQpHYt/hBQp4uZc3ByKSBFExEFcxNGhINJJROgoIgVxcCqF+hy8hTTk63Jt0jTvA78h4S7XPr3c+1FNY5m1CEqgzlYEr0tQAB22Ijyx+Ww+m89i89n80FUER5Lji2y+unbAlY95VZrL5ltojwxy0jhogJSP54s5H0CPgOlmBq5jcOgy5gCUFdYo0zNYJl2DXZcxNyCrsEaWnsEySRwJ6+AC/IFfKrON+gYJi7l3NLerKfAIZk3jJkFT4nUP9NUPS2OgDWq0+8X1Nvg0jWvbzJ8DLzRPp929YDO2xfu8V2vgjXZsVxvgyaP5GsULQQWsOIzrt/mdCNKjPJnmdu8LJG1MSNOPs+lgVIKOLj52XLIQq3t2AXcaPIMcOOGAK6dbkLEIohkPqWaCgusyXZ+DVZt1ziyCeOz1AyY83NMpK0oZru8pPhiLqZrF3BnwHoEia6gVl/bC0Eq2UVbyUD0PKusJut8Tu4RBC+gL+llDHLOnbH44a4i3fp7Nl2uF9MP8JZfUe6TMb1FLpOpQZcu0QqSrVZMeHIrSkZRo3on+1CvYUmyFqOz8Qlx2vWZTddcVWiEq5ou3qkGfIZZKUlHntxWiYv6+z1oosqoYsoo0BdacQitExXwvf0yNlETfqUlBV5z3eYt822srRFVNL4H2HwX9xmX0RsO6AAAA33RFWHRNYXRoTUwAPG1hdGggeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzE5OTgvTWF0aC9NYXRoTUwiPjxtc3R5bGUgbWF0aHNpemU9IjE0cHgiPjxtaT5oPC9taT48bWZlbmNlZD48bWk+eDwvbWk+PC9tZmVuY2VkPjxtbz49PC9tbz48bWZyYWM+PG1uPjE8L21uPjxtcm93Pjxtbj41PC9tbj48bWk+eDwvbWk+PG1vPis8L21vPjxtbj43PC9tbj48L21yb3c+PC9tZnJhYz48L21zdHlsZT48L21hdGg+evCxbQAAAABJRU5ErkJggg==" style="max-width: none; vertical-align: -11px;" width="95" />&nbsp;?&nbsp;

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