Factor
\frac{\left(x-4\right)\left(x+4\right)}{8}
Evaluate
\frac{x^{2}}{8}-2
Graph
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\frac{x^{2}-16}{8}
Factor out \frac{1}{8}.
\left(x-4\right)\left(x+4\right)
Consider x^{2}-16. Rewrite x^{2}-16 as x^{2}-4^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\frac{\left(x-4\right)\left(x+4\right)}{8}
Rewrite the complete factored expression.
\frac{x^{2}}{8}-\frac{2\times 8}{8}
To add or subtract expressions, expand them to make their denominators the same. Multiply 2 times \frac{8}{8}.
\frac{x^{2}-2\times 8}{8}
Since \frac{x^{2}}{8} and \frac{2\times 8}{8} have the same denominator, subtract them by subtracting their numerators.
\frac{x^{2}-16}{8}
Do the multiplications in x^{2}-2\times 8.
Examples
Quadratic equation
{ 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}