(x − 5) (a + x) = x2 − 25 হলে a এর মান কত?

A 25

B -25

C 5

D -5

Solution

Correct Answer: Option C

(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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