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

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

A. 2

B. 9

C. 12

D. 10

Answer: Option B

4x² - 12x + k
for perfect square must be
b² = 4ac
12 × 12 = 4 × 4 × k
9 = k
k = 9

This Question Belongs to Arithmetic Ability >> Number System

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