How do you solve sqrt(5x^2 - 40)= 0?

2 Answers
Mar 12, 2018

x = 2sqrt(2) and x = -2sqrt(2)

Explanation:

Square both sides:

5x^2 - 40 = 0

5x^2 = 40

x^2 = 8

x = +- sqrt(8)

x = +-2sqrt(2)

Both these solutions are valid as they satisfy the original equation.

Hopefully this helps!

Mar 12, 2018

x = +- sqrt(8)

Explanation:

  1. First, square both sides of the equation, so 5x^2-40=0
  2. Add 40 to both sides: 5x^2=40
  3. Divide by 5 on both sides: x^2=8
  4. Square root on both sides: x= +- sqrt(8)