Evaluate
2x\left(x+2\right)
Expand
2x^{2}+4x
Graph
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x^{2}-4+x^{2}+4x+4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
2x^{2}-4+4x+4
Combine x^{2} and x^{2} to get 2x^{2}.
2x^{2}+4x
Add -4 and 4 to get 0.
x^{2}-4+x^{2}+4x+4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
2x^{2}-4+4x+4
Combine x^{2} and x^{2} to get 2x^{2}.
2x^{2}+4x
Add -4 and 4 to get 0.
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