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147x^{2}+78x+42
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147x^{2}+78x+42
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15x+147x^{2}+63x+42
Use the distributive property to multiply 21 by 7x^{2}+3x+2.
78x+147x^{2}+42
Combine 15x and 63x to get 78x.
15x+147x^{2}+63x+42
Use the distributive property to multiply 21 by 7x^{2}+3x+2.
78x+147x^{2}+42
Combine 15x and 63x to get 78x.
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