Question

What is the solution set of 4x^2 - 36 = 0

Answer 1

\[4x^2 - 36 = 0 => x^2 - 9 = 0 => (x+3)(x-3) = 0 => x = -3 or 3\]

Answer 2

4(x^2 - 9)=0
4(x+3)(x-3)=0
x=-3 or x=3

Answer 3

+-
3