Evaluate
-\left(x-13\right)\left(x+1\right)
Expand
13+12x-x^{2}
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49-\left(36-12x+x^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(6-x\right)^{2}.
49-36+12x-x^{2}
To find the opposite of 36-12x+x^{2}, find the opposite of each term.
13+12x-x^{2}
Subtract 36 from 49 to get 13.
49-\left(36-12x+x^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(6-x\right)^{2}.
49-36+12x-x^{2}
To find the opposite of 36-12x+x^{2}, find the opposite of each term.
13+12x-x^{2}
Subtract 36 from 49 to get 13.
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