Evaluate
85
Factor
5\times 17
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14+9+8+10+6+9+10+10+9
Add 6 and 8 to get 14.
23+8+10+6+9+10+10+9
Add 14 and 9 to get 23.
31+10+6+9+10+10+9
Add 23 and 8 to get 31.
41+6+9+10+10+9
Add 31 and 10 to get 41.
47+9+10+10+9
Add 41 and 6 to get 47.
56+10+10+9
Add 47 and 9 to get 56.
66+10+9
Add 56 and 10 to get 66.
76+9
Add 66 and 10 to get 76.
85
Add 76 and 9 to get 85.
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}