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  • 25-10-2016
  • Mathematics
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how do i make this expression a perfect square? y^2-18y+

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apologiabiology
apologiabiology apologiabiology
  • 25-10-2016
take 1/2 of liear coefient, and square it

-18/2=-9, (-9)^2=81
add 81
factors to (y-9)²
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