Evaluate
4x\left(2x+3\right)
Expand
8x^{2}+12x
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4x^{2}-9+4x^{2}+12x+9
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+3\right)^{2}.
8x^{2}-9+12x+9
Combine 4x^{2} and 4x^{2} to get 8x^{2}.
8x^{2}+12x
Add -9 and 9 to get 0.
4x^{2}-9+4x^{2}+12x+9
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+3\right)^{2}.
8x^{2}-9+12x+9
Combine 4x^{2} and 4x^{2} to get 8x^{2}.
8x^{2}+12x
Add -9 and 9 to get 0.
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Limits
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