x2+x-20 এর উৎপাদকে বিশ্লষণ করতে হবে?

A (x-5)(x-4)

B (x+5)(x-4)

C (x-5)(x+4)

D (x+5)(x+4)

Solution

Correct Answer: Option B

x2 + x - 20 

= x2 + 5x - 4x - 20 

= x (x+5)-4( x+5 ) 

=(x+5)(x-4) 

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