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48x+4
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9x^{2}+12x+4-9x\left(x-4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+2\right)^{2}.
9x^{2}+12x+4-9x^{2}+36x
Use the distributive property to multiply -9x by x-4.
12x+4+36x
Combine 9x^{2} and -9x^{2} to get 0.
48x+4
Combine 12x and 36x to get 48x.
9x^{2}+12x+4-9x\left(x-4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+2\right)^{2}.
9x^{2}+12x+4-9x^{2}+36x
Use the distributive property to multiply -9x by x-4.
12x+4+36x
Combine 9x^{2} and -9x^{2} to get 0.
48x+4
Combine 12x and 36x to get 48x.
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