Evaluate
-15
Factor
-15
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-1+3-14+15-16+17-18+19-20
Subtract 12 from 11 to get -1.
2-14+15-16+17-18+19-20
Add -1 and 3 to get 2.
-12+15-16+17-18+19-20
Subtract 14 from 2 to get -12.
3-16+17-18+19-20
Add -12 and 15 to get 3.
-13+17-18+19-20
Subtract 16 from 3 to get -13.
4-18+19-20
Add -13 and 17 to get 4.
-14+19-20
Subtract 18 from 4 to get -14.
5-20
Add -14 and 19 to get 5.
-15
Subtract 20 from 5 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}