x2-(a+b)x+ab=0; x=?
A
a,b
B
a
C
b
D
ab
Correct Answer: a,b
x2 - (a + b)x + ab = 0⇒x2 - ax - bx + ab = 0⇒x(x - a) - b(x - a) = 0⇒(x - a)(x - b) = 0x - a = 0 , x - b = 0x = a , x = b