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2\left(4x^{2}+12x+9\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+3\right)^{2}.
8x^{2}+24x+18
Use the distributive property to multiply 2 by 4x^{2}+12x+9.
2\left(4x^{2}+12x+9\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+3\right)^{2}.
8x^{2}+24x+18
Use the distributive property to multiply 2 by 4x^{2}+12x+9.