Evaluate
\left(5a-b\right)\left(a+3b\right)
Expand
5a^{2}+14ab-3b^{2}
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5a^{2}-ab+15ba-3b^{2}
Apply the distributive property by multiplying each term of a+3b by each term of 5a-b.
5a^{2}+14ab-3b^{2}
Combine -ab and 15ba to get 14ab.
5a^{2}-ab+15ba-3b^{2}
Apply the distributive property by multiplying each term of a+3b by each term of 5a-b.
5a^{2}+14ab-3b^{2}
Combine -ab and 15ba to get 14ab.
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