Evaluate
42
Factor
2\times 3\times 7
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8+8+8+6+4+4+1+2+1
Add 3 and 5 to get 8.
16+8+6+4+4+1+2+1
Add 8 and 8 to get 16.
24+6+4+4+1+2+1
Add 16 and 8 to get 24.
30+4+4+1+2+1
Add 24 and 6 to get 30.
34+4+1+2+1
Add 30 and 4 to get 34.
38+1+2+1
Add 34 and 4 to get 38.
39+2+1
Add 38 and 1 to get 39.
41+1
Add 39 and 2 to get 41.
42
Add 41 and 1 to get 42.
Examples
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{ 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}