Question

factorise 15x² - 12x - 3

Answer 1

Step-by-step explanation:

15x² - 12x - 3

(3)(5x²-4x-1)

(3)(5x²-5x+x-1)

(3)(5x(x-1)+1(x-1))

(3)(5x+1)(x-1)

Answer 2

Step-by-step explanation:

15 x^2 - 12x - 3

Divide the equation by 3

5x^2 - 4x - 1

By splitting the middle term ;

5x^2 - 5x + 1x - 1

5x ( x - 1 ) + 1 ( x - 1)

(x - 1)(5x+1)

x = 1 or x = - 1 / 5