Evaluate
12
Factor
2^{2}\times 3
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3\left(3\left(-2-4\right)+15\right)+21
Add -8 and 6 to get -2.
3\left(3\left(-6\right)+15\right)+21
Subtract 4 from -2 to get -6.
3\left(-18+15\right)+21
Multiply 3 and -6 to get -18.
3\left(-3\right)+21
Add -18 and 15 to get -3.
-9+21
Multiply 3 and -3 to get -9.
12
Add -9 and 21 to get 12.
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}