যদি (a – 5)(a + x) = a 2 - 25 হয়, তবে x এর মান কত?

 

A ৫

B ২৫

C -৫

D -২৫

Solution

Correct Answer: Option A

(a – 5)(a + x) = a 2 - 25 
⇒(a – 5)(a + x) =(a – 5)(a + 5) 
⇒a+x=a+5
⇒x=5

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