Expand
495-6x-x^{2}
Evaluate
-\left(x+3\right)^{2}+504
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-\left(x^{2}+6x+9\right)+504
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
-x^{2}-6x-9+504
To find the opposite of x^{2}+6x+9, find the opposite of each term.
-x^{2}-6x+495
Add -9 and 504 to get 495.
-\left(x^{2}+6x+9\right)+504
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
-x^{2}-6x-9+504
To find the opposite of x^{2}+6x+9, find the opposite of each term.
-x^{2}-6x+495
Add -9 and 504 to get 495.
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