Question

factorise : 4x^3-4x^2-21x-9​

Answer 1

Step-by-step explanation:

(((4 • (x3)) - 22x2) - 21x) - 9

STEP

2

:

Equation at the end of step

2

:

((22x3 - 22x2) - 21x) - 9

STEP

3

:

Checking for a perfect cube

3.1 4x3-4x2-21x-9 is not a perfect cube

Trying to factor by pulling out :

3.2 Factoring: 4x3-4x2-21x-9

Thoughtfully split the expression at hand into groups, each group having two terms :

Group 1: -21x-9

Group 2: 4x3-4x2

Pull out from each group separately :

Group 1: (7x+3) • (-3)

Group 2: (x-1) • (4x2)

hope it helps.

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