tentukan nilai a, b, dan c.

kita gunakan pemfaktoran:
a. x^2 + x - 6 = 0
====> (x + 3) (x - 2) =0
====> x + 3 = 0 ----> x = -3
====> x - 2 = 0 ----> x = 2
jadi x1 = -3 atau x2 = 2

b. x^2 + 9x + 14 = 0
====> (x + 2) (x + 7) =0
====> (x + 2) = 0 -----> x = -2
====> (x + 7) = 0 -----> x = -7
jadi x1 = -2 atau x2 = -7

c. b. 2x^2 + x - 1 = 0
====> (2x - 1) (x + 1) =0
====> (2x - 1) = 0 ----> 2x = -1 ---> x = - 1/2
====> (x + 1) = 0 -----> x = -1
jadi x1 = - 1/2 atau x2 = -1

ok