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16-b^{2}
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16-b^{2}
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\left(-b\right)b-4\left(-b\right)-4b+16
Apply the distributive property by multiplying each term of -b-4 by each term of b-4.
\left(-b\right)b+4b-4b+16
Multiply -4 and -1 to get 4.
\left(-b\right)b+16
Combine 4b and -4b to get 0.
-b^{2}+16
Multiply b and b to get b^{2}.
\left(-b\right)b-4\left(-b\right)-4b+16
Apply the distributive property by multiplying each term of -b-4 by each term of b-4.
\left(-b\right)b+4b-4b+16
Multiply -4 and -1 to get 4.
\left(-b\right)b+16
Combine 4b and -4b to get 0.
-b^{2}+16
Multiply b and b to get b^{2}.
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