Jawapan

2015-04-29T11:36:36+08:00
4x² - 15 = -17x
4x² + 17x - 15 = 0
4x² + 20x - 3x - 15 = 0
(4x² + 20x) - (3x - 15) = 0
4x (x + 5) - 3 (x + 5) = 0
(4x - 3) (x + 5) = 0

4x - 3 = 0
     x₁ = 3/4
x + 5 = 0
     x₂ = -5
1 5 1