If x2 + 3x + c = (x + a)(x + b) for all x, what is the value of c ?
(1) a = 1
(2) b = 2
OA later
(1) a = 1
(2) b = 2
OA later
x^2 + 3x + c = (x + a)(x + b) = x^2+ (a+b)x +abmgmt_gmat wrote:If x2 + 3x + c = (x + a)(x + b) for all x, what is the value of c ?
(1) a = 1
(2) b = 2
OA later
comparing the coefficients
a+b = 3 -----(1)
ab = c -------(2)
1. a =1 ; using (1) b =2
c = ab = 2
Sufficient
2. b =2 using (1) a =1
c = ab = 2
Sufficient
D
