যদি x2 - 25 = 12 হয় এবং x + 5 = 4 হয় তবে x - 5 = কত?

A - 6

B - 2

C 3

D 14

Solution

Correct Answer: Option C

x2 - 25 = 12
⇒ (x + 5) (x - 5) = 12
⇒ 4 . (x - 5) = 12
⇒ (x - 5) = 3

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