Question

(x+3) (x+4) =2x (2x-1)

Answer 1

(x+3)(x+4) = 2x (2x-1)
x² + 4x + 3x + 12= 4x² - 2x
x² + 7x + 12 - 4x² + 2x = 0
- 3x² + 9x + 12 = 0 (-3)
   x² - 3x - 4 = 0
  Δ= 9 +16 = 25
√Δ= √25 = 5

x' = (3+5)/2= 4
x"= (3-5)/2 = -1