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-\left(x^{2}+2xa+a^{2}\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(x+a\right)^{2}.
-x^{2}-2xa-a^{2}
To find the opposite of x^{2}+2xa+a^{2}, find the opposite of each term.
-\left(x^{2}+2xa+a^{2}\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(x+a\right)^{2}.
-x^{2}-2xa-a^{2}
To find the opposite of x^{2}+2xa+a^{2}, find the opposite of each term.