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If 4x2 - 12x + k is a perfect square then...

This question belongs to Arithmetic Ability Number System
Number System
?

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

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