49x^2 - 9 = 0 As there is no x term, we can pretty much guess we have a situation where we factlrise by something known aa difference of two squares, so to factorise it: 49 = 7^2 9 = 3^2 x^2 = (x)^2 so... (7x - 3)(7x + 3) = 0 7x - 3 = 0 7x + 3 = 0 x = 3/7 x = -3/7
