Evaluate
\frac{x-5}{3\left(x-4\right)}
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\frac{x-5}{3\left(x-4\right)}
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\frac{2-x}{\left(x-4\right)\left(x+2\right)}+\frac{x+4}{3\left(x+2\right)}
Factor x^{2}-2x-8. Factor 3x+6.
\frac{3\left(2-x\right)}{3\left(x-4\right)\left(x+2\right)}+\frac{\left(x+4\right)\left(x-4\right)}{3\left(x-4\right)\left(x+2\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of \left(x-4\right)\left(x+2\right) and 3\left(x+2\right) is 3\left(x-4\right)\left(x+2\right). Multiply \frac{2-x}{\left(x-4\right)\left(x+2\right)} times \frac{3}{3}. Multiply \frac{x+4}{3\left(x+2\right)} times \frac{x-4}{x-4}.
\frac{3\left(2-x\right)+\left(x+4\right)\left(x-4\right)}{3\left(x-4\right)\left(x+2\right)}
Since \frac{3\left(2-x\right)}{3\left(x-4\right)\left(x+2\right)} and \frac{\left(x+4\right)\left(x-4\right)}{3\left(x-4\right)\left(x+2\right)} have the same denominator, add them by adding their numerators.
\frac{6-3x+x^{2}-4x+4x-16}{3\left(x-4\right)\left(x+2\right)}
Do the multiplications in 3\left(2-x\right)+\left(x+4\right)\left(x-4\right).
\frac{-10-3x+x^{2}}{3\left(x-4\right)\left(x+2\right)}
Combine like terms in 6-3x+x^{2}-4x+4x-16.
\frac{\left(x-5\right)\left(x+2\right)}{3\left(x-4\right)\left(x+2\right)}
Factor the expressions that are not already factored in \frac{-10-3x+x^{2}}{3\left(x-4\right)\left(x+2\right)}.
\frac{x-5}{3\left(x-4\right)}
Cancel out x+2 in both numerator and denominator.
\frac{x-5}{3x-12}
Expand 3\left(x-4\right).
\frac{2-x}{\left(x-4\right)\left(x+2\right)}+\frac{x+4}{3\left(x+2\right)}
Factor x^{2}-2x-8. Factor 3x+6.
\frac{3\left(2-x\right)}{3\left(x-4\right)\left(x+2\right)}+\frac{\left(x+4\right)\left(x-4\right)}{3\left(x-4\right)\left(x+2\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of \left(x-4\right)\left(x+2\right) and 3\left(x+2\right) is 3\left(x-4\right)\left(x+2\right). Multiply \frac{2-x}{\left(x-4\right)\left(x+2\right)} times \frac{3}{3}. Multiply \frac{x+4}{3\left(x+2\right)} times \frac{x-4}{x-4}.
\frac{3\left(2-x\right)+\left(x+4\right)\left(x-4\right)}{3\left(x-4\right)\left(x+2\right)}
Since \frac{3\left(2-x\right)}{3\left(x-4\right)\left(x+2\right)} and \frac{\left(x+4\right)\left(x-4\right)}{3\left(x-4\right)\left(x+2\right)} have the same denominator, add them by adding their numerators.
\frac{6-3x+x^{2}-4x+4x-16}{3\left(x-4\right)\left(x+2\right)}
Do the multiplications in 3\left(2-x\right)+\left(x+4\right)\left(x-4\right).
\frac{-10-3x+x^{2}}{3\left(x-4\right)\left(x+2\right)}
Combine like terms in 6-3x+x^{2}-4x+4x-16.
\frac{\left(x-5\right)\left(x+2\right)}{3\left(x-4\right)\left(x+2\right)}
Factor the expressions that are not already factored in \frac{-10-3x+x^{2}}{3\left(x-4\right)\left(x+2\right)}.
\frac{x-5}{3\left(x-4\right)}
Cancel out x+2 in both numerator and denominator.
\frac{x-5}{3x-12}
Expand 3\left(x-4\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}