Thread: Factorising

Please help in factorising this polynomial.

y = 2x^3 - x^2 - 8x + 4

also x + 2 is a factor
i used the remainder theorem and then long divided the equation
and i ended up with..

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

help? lol
many thanks

Originally Posted by raiden

Please help in factorising this polynomial.

y = 2x^3 - x^2 - 8x + 4

also x + 2 is a factor
i used the remainder theorem and then long divided the equation
and i ended up with..

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

help? lol
many thanks

Correction *Rayden not Raiden.

Anyways,
You have,

Group terms as,

Factor,

Factor again,

Factor again,