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12x^{2}+24x+9
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12x^{2}+24x+9
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12x^{2}+18x+6x+9
Apply the distributive property by multiplying each term of 6x+3 by each term of 2x+3.
12x^{2}+24x+9
Combine 18x and 6x to get 24x.
12x^{2}+18x+6x+9
Apply the distributive property by multiplying each term of 6x+3 by each term of 2x+3.
12x^{2}+24x+9
Combine 18x and 6x to get 24x.
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