CPM Homework Help : INT3 Problem 1-21

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1-21.

Factor each expression completely.

$x^2-x-72$
Hint (a):
Find two numbers that multiply to $−72$ and add to $−1$ .

$6x^2+48x$
Hint (b):
There are only $2$ terms, so factor out the greatest common factor.

$x^2-8x+16$
Hint (c):
Find two numbers that multiply to $16$ and add to $−8$ .
You may find a diamond helpful for this.

$x^2-49$
Hint (d):
Notice that this is the difference of squares.
Answer (d):
$(x+7)(x−7)$

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