Evaluate
-4\left(x+1\right)\left(x+6\right)
Expand
-4x^{2}-28x-24
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25-\left(4x^{2}+28x+49\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+7\right)^{2}.
25-4x^{2}-28x-49
To find the opposite of 4x^{2}+28x+49, find the opposite of each term.
-24-4x^{2}-28x
Subtract 49 from 25 to get -24.
25-\left(4x^{2}+28x+49\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+7\right)^{2}.
25-4x^{2}-28x-49
To find the opposite of 4x^{2}+28x+49, find the opposite of each term.
-24-4x^{2}-28x
Subtract 49 from 25 to get -24.
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