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OpenStudy (anonymous):
factor the perfect square 9y squared+42y+49+
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OpenStudy (anonymous):
9y squared +42y+49=
OpenStudy (saifoo.khan):
\[(7+3 y)(7+3 y)\]
OpenStudy (anonymous):
you know that sqrt of 9 is 3, and sqrt of 49 is 7. Take this and instead of doing a perfect square (a+b)(a-b) do (a+b)(a+b) foil it again to see if it works. (3y+7)(3y-7)
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