f(x) = 2 * 2 - x + 9
f(-4) = 2 * 2 -(-4) + 9
f(-4) = 4 + 4 + 9 = 17
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a
You can find explanation and examples here: http://en.wikipedia.org/wiki/Polynomial_division
(b+8)(b+8)
count # of +/- signs, add one
when the equation is equal to zero. . .:)