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-\left(\left(-b\right)^{2}+2\left(-b\right)a+a^{2}\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(-b+a\right)^{2}.
-\left(b^{2}+2\left(-b\right)a+a^{2}\right)
Calculate -b to the power of 2 and get b^{2}.
-b^{2}-2\left(-b\right)a-a^{2}
To find the opposite of b^{2}+2\left(-b\right)a+a^{2}, find the opposite of each term.
-b^{2}+2ba-a^{2}
Multiply -2 and -1 to get 2.
-\left(\left(-b\right)^{2}+2\left(-b\right)a+a^{2}\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(-b+a\right)^{2}.
-\left(b^{2}+2\left(-b\right)a+a^{2}\right)
Calculate -b to the power of 2 and get b^{2}.
-b^{2}-2\left(-b\right)a-a^{2}
To find the opposite of b^{2}+2\left(-b\right)a+a^{2}, find the opposite of each term.
-b^{2}+2ba-a^{2}
Multiply -2 and -1 to get 2.