Question

Evaluate the expression given the variable replacements.

20ab
--------
(a - b)

(if a = 4 and b = -2)

Answer 1

`(-80)/(3)`

Explanation:

• 20ab/(a-b)
• [
  `((20)(4)(-2))/(4-(-2))`]/ Substitute the variables
• 
  `(-160)/(6)` Multiply numerator and add denominator
• 
  `(80)/(3)`