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-\left(x^{2}+7x+12.25\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3.5\right)^{2}.
-x^{2}-7x-12.25
To find the opposite of x^{2}+7x+12.25, find the opposite of each term.
-\left(x^{2}+7x+12.25\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3.5\right)^{2}.
-x^{2}-7x-12.25
To find the opposite of x^{2}+7x+12.25, find the opposite of each term.