( - 2,1 ) \cdot ( - 4 \frac { 2 } { 7 } )
Evaluate
9
Factor
3^{2}
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-2,1\left(-\frac{28+2}{7}\right)
Multiply 4 and 7 to get 28.
-2,1\left(-\frac{30}{7}\right)
Add 28 and 2 to get 30.
-\frac{21}{10}\left(-\frac{30}{7}\right)
Convert decimal number -2,1 to fraction -\frac{21}{10}.
\frac{-21\left(-30\right)}{10\times 7}
Multiply -\frac{21}{10} times -\frac{30}{7} by multiplying numerator times numerator and denominator times denominator.
\frac{630}{70}
Do the multiplications in the fraction \frac{-21\left(-30\right)}{10\times 7}.
9
Divide 630 by 70 to get 9.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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}