Evaluate
-\frac{6}{x^{2}-1}
Factor
-\frac{6}{x^{2}-1}
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-\frac{3\left(x+1\right)}{\left(x-1\right)\left(x+1\right)}+\frac{3\left(x-1\right)}{\left(x-1\right)\left(x+1\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of x-1 and x+1 is \left(x-1\right)\left(x+1\right). Multiply -\frac{3}{x-1} times \frac{x+1}{x+1}. Multiply \frac{3}{x+1} times \frac{x-1}{x-1}.
\frac{-3\left(x+1\right)+3\left(x-1\right)}{\left(x-1\right)\left(x+1\right)}
Since -\frac{3\left(x+1\right)}{\left(x-1\right)\left(x+1\right)} and \frac{3\left(x-1\right)}{\left(x-1\right)\left(x+1\right)} have the same denominator, add them by adding their numerators.
\frac{-3x-3+3x-3}{\left(x-1\right)\left(x+1\right)}
Do the multiplications in -3\left(x+1\right)+3\left(x-1\right).
\frac{-6}{\left(x-1\right)\left(x+1\right)}
Combine like terms in -3x-3+3x-3.
\frac{-6}{x^{2}-1}
Expand \left(x-1\right)\left(x+1\right).
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\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}