Question

factorise x^3-3x^2-154x+312​

Answer 1

Answer:

x(2x+1)(x-3)

Step-by-step explanation:

Well first factor out x, and get x(2x^2-5x-3). Now you have to factor 2x^2-5x+3. Because of the x^2 coefficient, the answer has to be in the form (2x+a)(x+b) for some a and b. Because of the x coefficient being negative, b is PROBABLY negative, thus a has to be positive. a and b multiply to 3. Test values for a and b: (3,-1) does not make -5 for the x-coefficient, while (1,-3) does.

You then have: x(2x+1)(x-3).

Answer 2

Answer:

(3,-1) is a correct answer Hope it helps you