Evaluate
-\left(2a-b\right)^{2}+1
Expand
1-b^{2}+4ab-4a^{2}
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1-\left(4a^{2}-4ab+b^{2}\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a-b\right)^{2}.
1-4a^{2}+4ab-b^{2}
To find the opposite of 4a^{2}-4ab+b^{2}, find the opposite of each term.
1-\left(4a^{2}-4ab+b^{2}\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a-b\right)^{2}.
1-4a^{2}+4ab-b^{2}
To find the opposite of 4a^{2}-4ab+b^{2}, find the opposite of each term.
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