Evaluate
\left(5a+4b\right)^{2}
Expand
25a^{2}+40ab+16b^{2}
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25a^{2}+40ab+16b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(-5a-4b\right)^{2}.
25a^{2}+40ab+16b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(-5a-4b\right)^{2}.
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