# How do you evaluate the following algebraic expression at b=-1 and simplify your answer -3(b-1)-4(b-3)?

Feb 18, 2017

$22$

#### Explanation:

$\text{Substitute "b=-1" into the expression}$

$\Rightarrow - 3 \left(\textcolor{red}{- 1} - 1\right) - 4 \left(\textcolor{red}{- 1} - 3\right)$

$= \left(- 3 \times - 2\right) + \left(- 4 \times - 4\right)$

$= 6 + 16$

$= 22$