Q314
If 4x2 - 12x + k is a perfect square. then the value of k is ?
A.
2
B.
9
AnswerC.
12
D.
10
Answer: Option B
Solution
Answer: Option B
Solution:
4x2 - 12x + kfor perfect square must be
b2 = 4ac
12 × 12 = 4 × 4 × k
9 = k
k = 9