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\left(x-1\right)\left(x+1\right)-\frac{x\left(x-2\right)\left(x+2\right)}{x}
Factor the expressions that are not already factored in \frac{x^{3}-4x}{x}.
\left(x-1\right)\left(x+1\right)-\left(x-2\right)\left(x+2\right)
Cancel out x in both numerator and denominator.
\left(x-1\right)\left(x+1\right)-\left(x^{2}-4\right)
Expand the expression.
\left(x-1\right)\left(x+1\right)-x^{2}+4
To find the opposite of x^{2}-4, find the opposite of each term.
x^{2}-1-x^{2}+4
Consider \left(x-1\right)\left(x+1\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 1.
-1+4
Combine x^{2} and -x^{2} to get 0.
3
Add -1 and 4 to get 3.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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}