Factor
13\left(x+y-1\right)\left(x+y+1\right)
Evaluate
13\left(\left(x+y\right)^{2}-1\right)
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13\left(x^{2}+2xy+y^{2}-1\right)
Factor out 13.
\left(x+y-1\right)\left(x+y+1\right)
Consider x^{2}+2xy+y^{2}-1. Rewrite x^{2}+2xy+y^{2}-1 as \left(x+y\right)^{2}-1^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
13\left(x+y-1\right)\left(x+y+1\right)
Rewrite the complete factored expression.
Examples
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Matrix
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Simultaneous equation
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Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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