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16x^{2}+52x-8
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16x^{2}+52x-8
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16x^{2}+8x+1+11\left(4x+1\right)-20
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x+1\right)^{2}.
16x^{2}+8x+1+44x+11-20
Use the distributive property to multiply 11 by 4x+1.
16x^{2}+52x+1+11-20
Combine 8x and 44x to get 52x.
16x^{2}+52x+12-20
Add 1 and 11 to get 12.
16x^{2}+52x-8
Subtract 20 from 12 to get -8.
16x^{2}+8x+1+11\left(4x+1\right)-20
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x+1\right)^{2}.
16x^{2}+8x+1+44x+11-20
Use the distributive property to multiply 11 by 4x+1.
16x^{2}+52x+1+11-20
Combine 8x and 44x to get 52x.
16x^{2}+52x+12-20
Add 1 and 11 to get 12.
16x^{2}+52x-8
Subtract 20 from 12 to get -8.
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