4x - 2x = 2x
7x2 -4x -5x2 +2x = 2x2 -2x
2x(2x - 1)
(2x-1)(2x-1) = 4x^2 -4x + 1
(2x - 1)(4x + 1)
Let 6x - 2x - 9 = a, where a is an arbitrary constant. Then 4x - 9 = a 4x = a+9 x = (a+9)/4
2x+7x-10=4x+3-2x 9x-10=2x+3 7x=13 x=13/7ans
3x - 5x + 4x = -2x +4x = 2x
(2x - 1)(2x + 1)
-x2+2x
4x - 7 = 2x + 5 2x - 7 = 5 2x = 12 x = 6.
4x2 - 9 = (2x + 3)(2x - 3)