Evaluate
\left(20-z\right)\left(z-6\right)
Expand
-z^{2}+26z-120
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20z-z^{2}-120+6z
Apply the distributive property by multiplying each term of z-6 by each term of 20-z.
26z-z^{2}-120
Combine 20z and 6z to get 26z.
20z-z^{2}-120+6z
Apply the distributive property by multiplying each term of z-6 by each term of 20-z.
26z-z^{2}-120
Combine 20z and 6z to get 26z.
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