Evaluate
\left(z-2\right)\left(z+1\right)
Expand
z^{2}-z-2
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\frac{z^{2}-z-2}{z-1}\times \frac{\left(z-1\right)\left(z+1\right)}{z+1}
Factor the expressions that are not already factored in \frac{z^{2}-1}{z+1}.
\frac{z^{2}-z-2}{z-1}\left(z-1\right)
Cancel out z+1 in both numerator and denominator.
z^{2}-z-2
Cancel out z-1 and z-1.
\frac{z^{2}-z-2}{z-1}\times \frac{\left(z-1\right)\left(z+1\right)}{z+1}
Factor the expressions that are not already factored in \frac{z^{2}-1}{z+1}.
\frac{z^{2}-z-2}{z-1}\left(z-1\right)
Cancel out z+1 in both numerator and denominator.
z^{2}-z-2
Cancel out z-1 and z-1.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}