Question

Solve for: 4x^2 - 9 = 0

Answer 1

Add 9 to both sides to get:
4x^2 = 9
Divide both sides by 4 to get:
x^2 = 9/4.
Remember that a square root can take both values, a negative and a positive, so we are left with:
x = +- sqrt(9/4) = +- (3/2)