Expand
20a^{2}+9ab+b^{2}
Evaluate
\left(4a+b\right)\left(5a+b\right)
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20a^{2}+4ab+5ba+b^{2}
Apply the distributive property by multiplying each term of 4a+b by each term of 5a+b.
20a^{2}+9ab+b^{2}
Combine 4ab and 5ba to get 9ab.
20a^{2}+4ab+5ba+b^{2}
Apply the distributive property by multiplying each term of 4a+b by each term of 5a+b.
20a^{2}+9ab+b^{2}
Combine 4ab and 5ba to get 9ab.
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