(x + 5)(x - 9) - 15 এর উৎপাদক কোনটি?

A x+10

B x-8

C x-10

D x+8

Correct Answer: Option C

(x + 5)(x - 9) - 15
= x² - 9x + 5x - 45 - 15
= x² - 4x - 60
= x² - 10x + 6x - 60
= x(x - 10) + 6(x - 10)
= (x - 10)(x + 6)