সূত্রের সাহায্যে (x+ 2)(x- 2x+ 4) এর গুণফল কত?

A x+ 8

B x+ 8

C x- 8

D x+ 8

Solution

Correct Answer: Option D

(x² + 2) (x⁴ - 2x² + 4)

= x²(x⁴ - 2x² + 4) + 2(x⁴ - 2x² + 4)

= x⁶ - 2x⁴ + 4x² + 2x⁴ - 4x² + 8

= x⁶ + 8

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