Evaluate
-\left(5b-y\right)^{2}+x
Expand
x-y^{2}+10by-25b^{2}
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x-\left(25b^{2}-10by+y^{2}\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(5b-y\right)^{2}.
x-25b^{2}+10by-y^{2}
To find the opposite of 25b^{2}-10by+y^{2}, find the opposite of each term.
x-\left(25b^{2}-10by+y^{2}\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(5b-y\right)^{2}.
x-25b^{2}+10by-y^{2}
To find the opposite of 25b^{2}-10by+y^{2}, find the opposite of each term.
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