Evaluate
15
Factor
3\times 5
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4-\frac{4\left(-1\right)}{2}+9
Express 4\left(-\frac{1}{2}\right) as a single fraction.
4-\frac{-4}{2}+9
Multiply 4 and -1 to get -4.
4-\left(-2\right)+9
Divide -4 by 2 to get -2.
4+2+9
The opposite of -2 is 2.
6+9
Add 4 and 2 to get 6.
15
Add 6 and 9 to get 15.
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}