Evaluate
2\left(x-2\right)\left(x+4\right)
Expand
2x^{2}+4x-16
Graph
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2\left(x^{2}+2x+1\right)-18
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
2x^{2}+4x+2-18
Use the distributive property to multiply 2 by x^{2}+2x+1.
2x^{2}+4x-16
Subtract 18 from 2 to get -16.
2\left(x^{2}+2x+1\right)-18
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
2x^{2}+4x+2-18
Use the distributive property to multiply 2 by x^{2}+2x+1.
2x^{2}+4x-16
Subtract 18 from 2 to get -16.
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