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a^{2}+7a+15b
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a^{2}+7a+15b
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3a+15b+a\left(a+4\right)
Use the distributive property to multiply 3 by a+5b.
3a+15b+a^{2}+4a
Use the distributive property to multiply a by a+4.
7a+15b+a^{2}
Combine 3a and 4a to get 7a.
3a+15b+a\left(a+4\right)
Use the distributive property to multiply 3 by a+5b.
3a+15b+a^{2}+4a
Use the distributive property to multiply a by a+4.
7a+15b+a^{2}
Combine 3a and 4a to get 7a.
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