Help Solving This?

Question

1. x-3x^1/2+2=0

Answer 1

let u = x^1/2. then you have

u^2 - 3u + 2 = 0
(u-2)(u-1) = 0
u = 1 or 2

so, x^1/2 = 1 or 2
x = 1 or 4