Evaluate
\left(4b-5a\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}.
Examples
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Matrix
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Limits
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