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Aptitude · Q314

Number System

Competitive Exams · Aptitude · question 314

Q314

If 4x2 - 12x + k is a perfect square. then the value of k is ?

A.
2
B.
9
Answer
C.
12
D.
10

Answer: Option B

Solution

Answer: Option B
Solution:
4x2 - 12x + k
for perfect square must be
b2 = 4ac
12 × 12 = 4 × 4 × k
9 = k
k = 9