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Find the product. (-d + 4)(-d - 4)
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2 votes
Find the product.

(-d + 4)(-d - 4)

User Lewistrick
by
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1 Answer

5 votes
Use foil
f: -d * - d = d^2
o: -d*-4 = 4d
i: 4 * - d = -4d
l: -4 * 4 = -16

d^2 + 4d - 4d - 16
d^2 - 16 The middle two terms cancel out.
User Filippo Vicari
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