Answer:
16x^2 - 9 = 0
(4x)^2 - 3^2 = 0
a^2 - b^2 = (a - b) (a + b)
Hence, (4x - 3) (4x + 3) = 0
Either (4x - 3) = 0 or (4x + 3) = 0
4x = 3 or 4x = -3
x = 3/4 or x = -3/4
