(x+5) (x-9)-15 এর উৎপাদক হবে-

A (x-10) (x+6)

B (x+10) (x+6)

C (x-11) (x+6)

D (x-10) (x-6)

Correct Answer: Option A

(x+5) (x-9)-15
= (x+5) (x+5-14)
=a(a-14)-15 [x+5= a ধরে]
=a²-14a-15
=a²-15a+a-15
=a(a-15)+1(a-15)
=(a-15)(a+1)
=(ax+5-15)(x+5+1)
-(x-10)(x+6)