Evaluate
\left(8a-b\right)\left(5a+4b\right)
Expand
40a^{2}+27ab-4b^{2}
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40a^{2}-5ab+32ba-4b^{2}
Apply the distributive property by multiplying each term of 5a+4b by each term of 8a-b.
40a^{2}+27ab-4b^{2}
Combine -5ab and 32ba to get 27ab.
40a^{2}-5ab+32ba-4b^{2}
Apply the distributive property by multiplying each term of 5a+4b by each term of 8a-b.
40a^{2}+27ab-4b^{2}
Combine -5ab and 32ba to get 27ab.
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