Tolong bantu saya!!!

2x² + 5x - 3
(2x² + 6x) - (x - 3)
2x(x + 3) - 1(x + 3)
(2x - 1)(x + 3)

x² - 2x - 15 = 0
-5 x 3 = -15
-5 + 3 = -2
(x -5) (x + 3) = 0
x - 5 = 0  atau x + 3 = 0
x = 5               x = -3


Tantangan.
2x² + 5x - 3 = 0
-1 x 6 = -6
-1 + 6 = 5
(2x -1) (2x + 6)
------------------        = 0
         2

(2x - 1) (x + 3) = 0
2x - 1 = 0 atau x + 3 = 0
2x = 1              x = -3
x = 1/2