Evaluate
-\left(x-15\right)\left(x+9\right)
Expand
135+6x-x^{2}
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144-\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}.
144-x^{2}+6x-9
To find the opposite of x^{2}-6x+9, find the opposite of each term.
135-x^{2}+6x
Subtract 9 from 144 to get 135.
144-\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}.
144-x^{2}+6x-9
To find the opposite of x^{2}-6x+9, find the opposite of each term.
135-x^{2}+6x
Subtract 9 from 144 to get 135.
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