Well, isn't that a happy little math problem? When you have 4x and take away 2x, you are left with 2x. It's just like painting a beautiful landscape - sometimes you have to simplify things to see the true beauty underneath.
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)
8x^2 + 6x - 5 = 8x^2 + 10x - 4x - 5 = 2x * (4x + 5) - (4x + 5) = (2x -1) * (4x + 5)