Evaluate
a\left(a+3\right)\left(a+7\right)
Expand
a^{3}+10a^{2}+21a
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\left(a^{2}+7a\right)\left(a+3\right)
Combine 6a and a to get 7a.
a^{3}+10a^{2}+21a
Use the distributive property to multiply a^{2}+7a by a+3 and combine like terms.
\left(a^{2}+7a\right)\left(a+3\right)
Combine 6a and a to get 7a.
a^{3}+10a^{2}+21a
Use the distributive property to multiply a^{2}+7a by a+3 and combine like terms.
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