Question

What are the solutions to the quadratic equation 4x2 = 64?

x = −16 and x = 16
x = −8 and x = 8
x = −4 and x = 4
x = −2 and x = 2

Answer 1

the 3rd one x = -4 and x = 4.

Answer 2

Option 3rd is correct

x = -4 and x = 4

Explanation:

Given the equation:

`4x^2 = 64`

Divide both sides by 4 we have;

`x^2 = 16`

Take square root both sides we have;

`√(x^2) = \pm √(16)`

Simplify:

`x = \pm 4`

Therefore, the solution for the given equation are:

x = -4 and x = 4