CPM Homework Help : PC Problem 3-91

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3-91.

Factor.

Hint:

$a^2−b^2=(a+b)(a−b)$

$4x^2-y^2$
Hint (a):
$a=2x$ , $b=y$
Answer (a):
$(2x−y)(2x+y)$

$9z^4-y^2$
Hint (b):
$a=3z^2$

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