9x2-9x-4 এর উৎপাদক কত? 

A (3x+1)(3x-4)

B (3x-1)(3x-4)

C (3x-1)(3x+4)

D (3x+1)(3x+4)

Solution

Correct Answer: Option A

9x2-9x-4
=9x2+3x-12x-4
=3x(3x+1)-4(3x+1)
=(3x+1)(3x-4)

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