যদি (x - 5) (a + x) = x2 - 25 হয় তবে a এর মান কত?

A 5

B -5

C 25

D -25

Solution

Correct Answer: Option A

(x-5)(a+x)=x² -25
বা, (x-5)(a+x)=(x-5)(x+5)
বা , a+x=x+5
∴ a=5

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