X² + 2x - 3 = X² - 4x - 5 = X² + 3x - 10 = 2x² + 7x + 6 =

a.
x² + 2x - 3 = 0
(x+3)(x-2) = 0
x = –3 atau x = 2

b.
x²-4x-5 = 0
(x-5)(x+1) = 0
x = 5 atau x = –1

c.
x²+3x-10 = 0
(x+5)(x-2) = 0
x = –5 atau x = 2

d.
2x² + 7x +6 = 0
(2x+3)(x+2)=0
x = –3/2 atau x = –2