যদি (x-5)(a+x)=x²-25 তবে a এর মান কত?
Solution
Correct Answer: Option B
(x-5)(a+x)=x²-25
বা,(x-5)(a+x)=(x+5)(x-5)
বা,a+x=x+5
বা,a=5
বা,(x-5)(a+x)=(x+5)(x-5)
বা,a+x=x+5
বা,a=5
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