Subtract 9 from each side: 4x2 + 4x - 8 = 0
Simplify: 4(x2 + x - 2) = 0
Factorise: 4(x + 2)(x - 1) = 0
So x = -2 or 1 both of which satisfy the original equation.
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-((4x + 1)(x - 1))
The answer is: x = -5/2 and x = 7/2
4x2-5x+1 = 0 (4x-1)(x-1) = 0 x = 1/4 or x = 1
4x2 - 4x + 2xy - 2y = 4x(x - 1) + 2y(x - 1) = (x - 1)(4x + 2y) = 2(x - 1)(2x + y)
4x2 - 13 x + 3 = 0 (4x - 1)(x - 3) = 0 x = 3, 1/4