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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