Evaluate
-21x
Expand
-21x
Graph
Share
Copied to clipboard
\frac{3x\left(x-6\right)\times 7\left(x-9\right)}{\left(9-x\right)\left(x-6\right)}
Divide \frac{3x\left(x-6\right)}{9-x} by \frac{x-6}{7\left(x-9\right)} by multiplying \frac{3x\left(x-6\right)}{9-x} by the reciprocal of \frac{x-6}{7\left(x-9\right)}.
\frac{-3\times 7x\left(x-6\right)\left(-x+9\right)}{\left(x-6\right)\left(-x+9\right)}
Extract the negative sign in x-9.
-3\times 7x
Cancel out \left(x-6\right)\left(-x+9\right) in both numerator and denominator.
-21x
Multiply -3 and 7 to get -21.
\frac{3x\left(x-6\right)\times 7\left(x-9\right)}{\left(9-x\right)\left(x-6\right)}
Divide \frac{3x\left(x-6\right)}{9-x} by \frac{x-6}{7\left(x-9\right)} by multiplying \frac{3x\left(x-6\right)}{9-x} by the reciprocal of \frac{x-6}{7\left(x-9\right)}.
\frac{-3\times 7x\left(x-6\right)\left(-x+9\right)}{\left(x-6\right)\left(-x+9\right)}
Extract the negative sign in x-9.
-3\times 7x
Cancel out \left(x-6\right)\left(-x+9\right) in both numerator and denominator.
-21x
Multiply -3 and 7 to get -21.
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}