If |20x-10| = 90, then find the product of the values of x?

If |20x-10| = 90, then find the product of the values of x?

Quiz

Answer/Solution

-20

Steps/Work

|20x-10| = 90
20x-10 = 90 or 20x-10 = -90
20x = 100 or 20x = -80
x = 5 or x = -4
product = -4*5 = -20
Answer is E