Evaluate
z-7
Factor
z-7
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\frac{z^{2}-49}{z+7}
Since \frac{z^{2}}{z+7} and \frac{49}{z+7} have the same denominator, subtract them by subtracting their numerators.
\frac{\left(z-7\right)\left(z+7\right)}{z+7}
Factor the expressions that are not already factored in \frac{z^{2}-49}{z+7}.
z-7
Cancel out z+7 in both numerator and denominator.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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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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