Evaluate
\frac{3-5a}{9-a^{2}}
Expand
\frac{3-5a}{9-a^{2}}
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\frac{2\left(a-1\right)}{\left(a-1\right)\left(a+3\right)}-\frac{3a+3}{9-a^{2}}
Factor the expressions that are not already factored in \frac{2a-2}{a^{2}+2a-3}.
\frac{2}{a+3}-\frac{3a+3}{9-a^{2}}
Cancel out a-1 in both numerator and denominator.
\frac{2}{a+3}-\frac{3a+3}{\left(a-3\right)\left(-a-3\right)}
Factor 9-a^{2}.
\frac{2\left(a-3\right)}{\left(a-3\right)\left(a+3\right)}-\frac{-\left(3a+3\right)}{\left(a-3\right)\left(a+3\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of a+3 and \left(a-3\right)\left(-a-3\right) is \left(a-3\right)\left(a+3\right). Multiply \frac{2}{a+3} times \frac{a-3}{a-3}. Multiply \frac{3a+3}{\left(a-3\right)\left(-a-3\right)} times \frac{-1}{-1}.
\frac{2\left(a-3\right)-\left(-\left(3a+3\right)\right)}{\left(a-3\right)\left(a+3\right)}
Since \frac{2\left(a-3\right)}{\left(a-3\right)\left(a+3\right)} and \frac{-\left(3a+3\right)}{\left(a-3\right)\left(a+3\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{2a-6+3a+3}{\left(a-3\right)\left(a+3\right)}
Do the multiplications in 2\left(a-3\right)-\left(-\left(3a+3\right)\right).
\frac{5a-3}{\left(a-3\right)\left(a+3\right)}
Combine like terms in 2a-6+3a+3.
\frac{5a-3}{a^{2}-9}
Expand \left(a-3\right)\left(a+3\right).
\frac{2\left(a-1\right)}{\left(a-1\right)\left(a+3\right)}-\frac{3a+3}{9-a^{2}}
Factor the expressions that are not already factored in \frac{2a-2}{a^{2}+2a-3}.
\frac{2}{a+3}-\frac{3a+3}{9-a^{2}}
Cancel out a-1 in both numerator and denominator.
\frac{2}{a+3}-\frac{3a+3}{\left(a-3\right)\left(-a-3\right)}
Factor 9-a^{2}.
\frac{2\left(a-3\right)}{\left(a-3\right)\left(a+3\right)}-\frac{-\left(3a+3\right)}{\left(a-3\right)\left(a+3\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of a+3 and \left(a-3\right)\left(-a-3\right) is \left(a-3\right)\left(a+3\right). Multiply \frac{2}{a+3} times \frac{a-3}{a-3}. Multiply \frac{3a+3}{\left(a-3\right)\left(-a-3\right)} times \frac{-1}{-1}.
\frac{2\left(a-3\right)-\left(-\left(3a+3\right)\right)}{\left(a-3\right)\left(a+3\right)}
Since \frac{2\left(a-3\right)}{\left(a-3\right)\left(a+3\right)} and \frac{-\left(3a+3\right)}{\left(a-3\right)\left(a+3\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{2a-6+3a+3}{\left(a-3\right)\left(a+3\right)}
Do the multiplications in 2\left(a-3\right)-\left(-\left(3a+3\right)\right).
\frac{5a-3}{\left(a-3\right)\left(a+3\right)}
Combine like terms in 2a-6+3a+3.
\frac{5a-3}{a^{2}-9}
Expand \left(a-3\right)\left(a+3\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}