Evaluate
\left(2-x\right)\left(x+8\right)
Expand
16-6x-x^{2}
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25-\left(x^{2}+6x+9\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
25-x^{2}-6x-9
To find the opposite of x^{2}+6x+9, find the opposite of each term.
16-x^{2}-6x
Subtract 9 from 25 to get 16.
25-\left(x^{2}+6x+9\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
25-x^{2}-6x-9
To find the opposite of x^{2}+6x+9, find the opposite of each term.
16-x^{2}-6x
Subtract 9 from 25 to get 16.
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