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18x^{2}+36x+16
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18x^{2}+36x+16
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9x^{2}+24x+16+9x^{2}+12x
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+4\right)^{2}.
18x^{2}+24x+16+12x
Combine 9x^{2} and 9x^{2} to get 18x^{2}.
18x^{2}+36x+16
Combine 24x and 12x to get 36x.
9x^{2}+24x+16+9x^{2}+12x
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+4\right)^{2}.
18x^{2}+24x+16+12x
Combine 9x^{2} and 9x^{2} to get 18x^{2}.
18x^{2}+36x+16
Combine 24x and 12x to get 36x.
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