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28x-98
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28x-98
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4x^{2}-49-\left(4x^{2}-28x+49\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-7\right)^{2}.
4x^{2}-49-4x^{2}+28x-49
To find the opposite of 4x^{2}-28x+49, find the opposite of each term.
-49+28x-49
Combine 4x^{2} and -4x^{2} to get 0.
-98+28x
Subtract 49 from -49 to get -98.
4x^{2}-49-\left(4x^{2}-28x+49\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-7\right)^{2}.
4x^{2}-49-4x^{2}+28x-49
To find the opposite of 4x^{2}-28x+49, find the opposite of each term.
-49+28x-49
Combine 4x^{2} and -4x^{2} to get 0.
-98+28x
Subtract 49 from -49 to get -98.
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