CPM Homework Help : PC Problem 1-136

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1-136.

Fill in the blanks to make the following equations correct.

$x^{2} + 6x + \text{____} = \left(x + 3\right)^{2}$
Answer (a):
$9$

$x^{2} − \text{____} x + 16 = \left(x − 4\right)^{2}$
Answer (b):
$8$

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