Evaluate
20
Factor
2^{2}\times 5
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-7+12+1-8+12+1-8+12+1-8+12
Subtract 8 from 1 to get -7.
5+1-8+12+1-8+12+1-8+12
Add -7 and 12 to get 5.
6-8+12+1-8+12+1-8+12
Add 5 and 1 to get 6.
-2+12+1-8+12+1-8+12
Subtract 8 from 6 to get -2.
10+1-8+12+1-8+12
Add -2 and 12 to get 10.
11-8+12+1-8+12
Add 10 and 1 to get 11.
3+12+1-8+12
Subtract 8 from 11 to get 3.
15+1-8+12
Add 3 and 12 to get 15.
16-8+12
Add 15 and 1 to get 16.
8+12
Subtract 8 from 16 to get 8.
20
Add 8 and 12 to get 20.
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}