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8x^{2}+4
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8x^{2}+4
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x^{2}+4x+4-x\left(4-7x\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
x^{2}+4x+4-\left(4x-7x^{2}\right)
Use the distributive property to multiply x by 4-7x.
x^{2}+4x+4-4x+7x^{2}
To find the opposite of 4x-7x^{2}, find the opposite of each term.
x^{2}+4+7x^{2}
Combine 4x and -4x to get 0.
8x^{2}+4
Combine x^{2} and 7x^{2} to get 8x^{2}.
x^{2}+4x+4-x\left(4-7x\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
x^{2}+4x+4-\left(4x-7x^{2}\right)
Use the distributive property to multiply x by 4-7x.
x^{2}+4x+4-4x+7x^{2}
To find the opposite of 4x-7x^{2}, find the opposite of each term.
x^{2}+4+7x^{2}
Combine 4x and -4x to get 0.
8x^{2}+4
Combine x^{2} and 7x^{2} to get 8x^{2}.
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