Question

Find x
1/2x^2+2/3=5/6
x^2+4/3=10/6
x^2=9/3 =3
x= square root 3 or - square root 3

But the answer book says the answer is +/- 1/3sq root 3 what did I do wrong ?

Answer 1

u wrote 2/3 in first step and 4/3 in second?