Evaluate
\frac{a+4}{2\left(a+1\right)}
Expand
\frac{a+4}{2\left(a+1\right)}
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\frac{a+2}{2\left(a-1\right)}-\frac{3}{\left(a-1\right)\left(a+1\right)}
Factor 2a-2. Factor a^{2}-1.
\frac{\left(a+2\right)\left(a+1\right)}{2\left(a-1\right)\left(a+1\right)}-\frac{3\times 2}{2\left(a-1\right)\left(a+1\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 2\left(a-1\right) and \left(a-1\right)\left(a+1\right) is 2\left(a-1\right)\left(a+1\right). Multiply \frac{a+2}{2\left(a-1\right)} times \frac{a+1}{a+1}. Multiply \frac{3}{\left(a-1\right)\left(a+1\right)} times \frac{2}{2}.
\frac{\left(a+2\right)\left(a+1\right)-3\times 2}{2\left(a-1\right)\left(a+1\right)}
Since \frac{\left(a+2\right)\left(a+1\right)}{2\left(a-1\right)\left(a+1\right)} and \frac{3\times 2}{2\left(a-1\right)\left(a+1\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{a^{2}+a+2a+2-6}{2\left(a-1\right)\left(a+1\right)}
Do the multiplications in \left(a+2\right)\left(a+1\right)-3\times 2.
\frac{a^{2}+3a-4}{2\left(a-1\right)\left(a+1\right)}
Combine like terms in a^{2}+a+2a+2-6.
\frac{\left(a-1\right)\left(a+4\right)}{2\left(a-1\right)\left(a+1\right)}
Factor the expressions that are not already factored in \frac{a^{2}+3a-4}{2\left(a-1\right)\left(a+1\right)}.
\frac{a+4}{2\left(a+1\right)}
Cancel out a-1 in both numerator and denominator.
\frac{a+4}{2a+2}
Expand 2\left(a+1\right).
\frac{a+2}{2\left(a-1\right)}-\frac{3}{\left(a-1\right)\left(a+1\right)}
Factor 2a-2. Factor a^{2}-1.
\frac{\left(a+2\right)\left(a+1\right)}{2\left(a-1\right)\left(a+1\right)}-\frac{3\times 2}{2\left(a-1\right)\left(a+1\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 2\left(a-1\right) and \left(a-1\right)\left(a+1\right) is 2\left(a-1\right)\left(a+1\right). Multiply \frac{a+2}{2\left(a-1\right)} times \frac{a+1}{a+1}. Multiply \frac{3}{\left(a-1\right)\left(a+1\right)} times \frac{2}{2}.
\frac{\left(a+2\right)\left(a+1\right)-3\times 2}{2\left(a-1\right)\left(a+1\right)}
Since \frac{\left(a+2\right)\left(a+1\right)}{2\left(a-1\right)\left(a+1\right)} and \frac{3\times 2}{2\left(a-1\right)\left(a+1\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{a^{2}+a+2a+2-6}{2\left(a-1\right)\left(a+1\right)}
Do the multiplications in \left(a+2\right)\left(a+1\right)-3\times 2.
\frac{a^{2}+3a-4}{2\left(a-1\right)\left(a+1\right)}
Combine like terms in a^{2}+a+2a+2-6.
\frac{\left(a-1\right)\left(a+4\right)}{2\left(a-1\right)\left(a+1\right)}
Factor the expressions that are not already factored in \frac{a^{2}+3a-4}{2\left(a-1\right)\left(a+1\right)}.
\frac{a+4}{2\left(a+1\right)}
Cancel out a-1 in both numerator and denominator.
\frac{a+4}{2a+2}
Expand 2\left(a+1\right).
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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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}