(x+5)(x-9)-15 এর উৎপাদক কোনটি?

(x+5)(x-9)-15 এর উৎপাদক কোনটি?

A x+10

B x-10

C x-8

D x-6

Solution

Correct Answer: Option B

(x+5)(x-9)-15

= x² + 5x -9x -45 -15

= x² - 4x - 60

= x² - 10x +6x -60

= x (x-10) + 6 (x-10)

= (x-10) (x+6)