barbara25 barbara25

04-04-2018
Mathematics

contestada

factor each polynomial y²-81

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idkwhat1 idkwhat1

04-04-2018

I'm if it's right but.....

you could square root the whole expression and get (y-9)(y-9)=(y-9)^2

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altavistard altavistard

04-04-2018

y^2-81 is the difference of two squares, namely, the difference of y squared less 9 squared. Therefore,

y^2-81 = (y-9)(y+9)

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