(x + 5)(x - 9) - 15 এর উৎপাদক কোনটি?
সমাধান
সঠিক উত্তর: 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)
= x2 - 9x + 5x - 45 - 15
= x2 - 4x - 60
= x2 - 10x + 6x - 60
= x(x - 10) + 6(x - 10)
= (x - 10)(x + 6)
