Evaluate
3x\left(x+4\right)
Expand
3x^{2}+12x
Graph
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3\left(x^{2}+4x+4\right)-12
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
3x^{2}+12x+12-12
Use the distributive property to multiply 3 by x^{2}+4x+4.
3x^{2}+12x
Subtract 12 from 12 to get 0.
3\left(x^{2}+4x+4\right)-12
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
3x^{2}+12x+12-12
Use the distributive property to multiply 3 by x^{2}+4x+4.
3x^{2}+12x
Subtract 12 from 12 to get 0.
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