# How do you evaluate \frac { 4\cdot ( x - 1) } { ( 1- x ) \cdot 2}?

Sep 6, 2017

$- 2$

#### Explanation:

$\frac{4 \cdot \left(x - 1\right)}{\left(1 - x\right) \cdot 2}$

change a sign for $\left(x - 1\right)$ to $- \left(- x + 1\right) = - \left(1 - x\right)$

$\frac{4 \cdot - \left(1 - x\right)}{\left(1 - x\right) \cdot 2} = \frac{- 4 \cdot \cancel{\left(1 - x\right)}}{\cancel{\left(1 - x\right)} \cdot 2}$

$= - \frac{4}{2} = - 2$