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x^{2}+8x+16+2\left(x+4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+4\right)^{2}.
x^{2}+8x+16+2x+8
Use the distributive property to multiply 2 by x+4.
x^{2}+10x+16+8
Combine 8x and 2x to get 10x.
x^{2}+10x+24
Add 16 and 8 to get 24.
x^{2}+8x+16+2\left(x+4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+4\right)^{2}.
x^{2}+8x+16+2x+8
Use the distributive property to multiply 2 by x+4.
x^{2}+10x+16+8
Combine 8x and 2x to get 10x.
x^{2}+10x+24
Add 16 and 8 to get 24.