CPM Homework Help : PC Problem 1-139

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1-139.

Factor each expression completely.

$(a−3)^2−(a−3)$
Hint (a):
Let $u = a − 3$ .

$5x(x−3)−4(3−x)$
Hint (b):
$3 − x = −\left(x − 3\right)$

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