Evaluate
-\frac{x^{2}}{9}+16
Factor
\frac{\left(-x-12\right)\left(x-12\right)}{9}
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\frac{16\times 9}{9}-\frac{x^{2}}{9}
To add or subtract expressions, expand them to make their denominators the same. Multiply 16 times \frac{9}{9}.
\frac{16\times 9-x^{2}}{9}
Since \frac{16\times 9}{9} and \frac{x^{2}}{9} have the same denominator, subtract them by subtracting their numerators.
\frac{144-x^{2}}{9}
Do the multiplications in 16\times 9-x^{2}.
\frac{144-x^{2}}{9}
Factor out \frac{1}{9}.
\left(12-x\right)\left(12+x\right)
Consider 144-x^{2}. Rewrite 144-x^{2} as 12^{2}-x^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(-x+12\right)\left(x+12\right)
Reorder the terms.
\frac{\left(-x+12\right)\left(x+12\right)}{9}
Rewrite the complete factored expression.
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}