Evaluate
-\left(2x-1\right)^{2}+x
Expand
-4x^{2}+5x-1
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x-\left(4x^{2}-4x+1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-1\right)^{2}.
x-4x^{2}+4x-1
To find the opposite of 4x^{2}-4x+1, find the opposite of each term.
5x-4x^{2}-1
Combine x and 4x to get 5x.
x-\left(4x^{2}-4x+1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-1\right)^{2}.
x-4x^{2}+4x-1
To find the opposite of 4x^{2}-4x+1, find the opposite of each term.
5x-4x^{2}-1
Combine x and 4x to get 5x.
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