Evaluate
\left(a+2\right)^{2}
Expand
a^{2}+4a+4
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\left(-a\right)^{2}-4\left(-a\right)+4
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(-a-2\right)^{2}.
a^{2}-4\left(-a\right)+4
Calculate -a to the power of 2 and get a^{2}.
a^{2}+4a+4
Multiply -4 and -1 to get 4.
\left(-a\right)^{2}-4\left(-a\right)+4
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(-a-2\right)^{2}.
a^{2}-4\left(-a\right)+4
Calculate -a to the power of 2 and get a^{2}.
a^{2}+4a+4
Multiply -4 and -1 to get 4.
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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