Question

Factorise 3x^3 - x^2 - 20x -12​​

Answer 1

Answer:

=(x + 2) (3x + 2)(x-3)

Step-by-step explanation:

3x³ - x² - 20x - 12 X

Use the rational root theorem

ao = 12,

an = 3

The dividers of ag: 1, 2, 3, 4, 6, 12, The dividers of an: 1,3

Therefore, check the following rational numbers: 1, 2, 3, 4, 6, 12

1,3

is a root of the expression, so factor out

X + 2

x³ - x² - 20x - 12 3x3 = (x+2). x + 2

- x² - 20x - 12 = 3x² - 7x-6

x + 2

= 3x² -7x-6

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