( d + e ) ^ { 2 } - 7 d e
Evaluate
\left(d+e\right)^{2}-7ed
Expand
d^{2}-5ed+e^{2}
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d^{2}+2de+e^{2}-7de
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(d+e\right)^{2}.
d^{2}-5de+e^{2}
Combine 2de and -7de to get -5de.
d^{2}+2de+e^{2}-7de
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(d+e\right)^{2}.
d^{2}-5de+e^{2}
Combine 2de and -7de to get -5de.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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