Evaluate
\left(a-3\right)\left(a+1\right)
Expand
a^{2}-2a-3
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a^{2}-2a+1-4
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(a-1\right)^{2}.
a^{2}-2a-3
Subtract 4 from 1 to get -3.
a^{2}-2a+1-4
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(a-1\right)^{2}.
a^{2}-2a-3
Subtract 4 from 1 to get -3.
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 ) }
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Limits
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