Thread: Rational Roots

Just quick:

I have (2x^4)+(4x^3)-(5x^2)-5x+2.
The only possible rational roots by the Rational Root Test are 1,-1,2,-2,.5,-.5.
The only one that works out of these is -1. Could someone just check this for me?

Jimmy

Originally Posted by JimmyT

Just quick:

I have (2x^4)+(4x^3)-(5x^2)-5x+2.
The only possible rational roots by the Rational Root Test are 1,-1,2,-2,.5,-.5.
The only one that works out of these is -1. Could someone just check this for me?

Jimmy

I agree. Good work!

You can always check these by division as well. You should be able to divide by x - (-1) either by long or synthetic division to find:

confirming that there is no remainder.

-Dan