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36x^{2}+60x+21
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36x^{2}+60x+21
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36x^{2}+18x+42x+21
Apply the distributive property by multiplying each term of 6x+7 by each term of 6x+3.
36x^{2}+60x+21
Combine 18x and 42x to get 60x.
36x^{2}+18x+42x+21
Apply the distributive property by multiplying each term of 6x+7 by each term of 6x+3.
36x^{2}+60x+21
Combine 18x and 42x to get 60x.
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