# Fractional indicies question

• September 28th 2008, 12:35 AM
StaryNight
Fractional indicies question
I have become stuck on the following equation which i have to solve as part of my homework:

$2x^(1/3)+x^(2/3)=3$

According to the answer book the two solutions are 1 and -27, so it must turn out to be quadratic. However, i can't figure out how to get there.

Any help would be greatly appreciated :)
• September 28th 2008, 12:47 AM
Kai
Hi StaryNight,

Use the substitution y= x^(1/3) and subsitute it in ur equation, hope it helps
• September 28th 2008, 01:58 AM
StaryNight
Cheers, that worked out fine. Wish i'd have thought of that in the first place.