If ( x + 2) and (x - 3) are the factors of $x^2 +k_1x + k_2$, then :
Answer & explanation
Correct answer: option 1
If ( x - 2) and (x + 3) are the factors of $x^2 +k_1x + k_2$ then,
Putting x = 2 in the given equation, we get
= 22 + 2k1 + k2 = 0
⇒ 2k1 + k2 = - 4 …..(A)
Similarly, Putting x = -3 in the given equation,
= (-3) 2 - 3k1 + k2 = 0
= - 3k1 + k2 = -9 ……(B)
Subtracting (A) and (B)
= 5k1 = 5
= k1 = 1
Putting value of k1 in (A)
= k2 = -6
k1 = 1 and k2 = -6