Evaluate
142
Factor
2\times 71
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80+20+10+10+12+10
Add 30 and 50 to get 80.
100+10+10+12+10
Add 80 and 20 to get 100.
110+10+12+10
Add 100 and 10 to get 110.
120+12+10
Add 110 and 10 to get 120.
132+10
Add 120 and 12 to get 132.
142
Add 132 and 10 to get 142.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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
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