Evaluate
\frac{a\left(5-z\right)}{z^{2}-1}
|z|\neq 1
Factor
\frac{a\left(5-z\right)}{z^{2}-1}
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\frac{2a\left(z+1\right)}{\left(z-1\right)\left(z+1\right)}-\frac{3a\left(z-1\right)}{\left(z-1\right)\left(z+1\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of z-1 and z+1 is \left(z-1\right)\left(z+1\right). Multiply \frac{2a}{z-1} times \frac{z+1}{z+1}. Multiply \frac{3a}{z+1} times \frac{z-1}{z-1}.
\frac{2a\left(z+1\right)-3a\left(z-1\right)}{\left(z-1\right)\left(z+1\right)}
Since \frac{2a\left(z+1\right)}{\left(z-1\right)\left(z+1\right)} and \frac{3a\left(z-1\right)}{\left(z-1\right)\left(z+1\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{2az+2a-3az+3a}{\left(z-1\right)\left(z+1\right)}
Do the multiplications in 2a\left(z+1\right)-3a\left(z-1\right).
\frac{-az+5a}{\left(z-1\right)\left(z+1\right)}
Combine like terms in 2az+2a-3az+3a.
\frac{-az+5a}{z^{2}-1}
Expand \left(z-1\right)\left(z+1\right).
Examples
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{ 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}