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If you mean y2+8y+7=0 then it is a quadratic.

y2+8y+7+9-9=0

y2+8y+16-9=0

(y+4)2=9

y+4=3 , y+4=-3

y=-1 , y=-7

So y can equal -1 or -7.

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Q: What is the answer to y2 plus 8y plus 7?
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