Question 841022
{{{9x^4 - 28x^2 + 3 = 0}}}
{{{y=x^2}}}
{{{9y^2-28y+3=0}}}
{{{(9y-1)(y-3)=0}}}
Two solutions:
{{{9y-1=0}}}
{{{9y=1}}}
{{{y=1/9}}}
{{{x^2=1/9}}}
{{{x=0 +- 1/3}}}
and
{{{y-3=0}}}
{{{y=3}}}
{{{x^2=3}}}
{{{x=0 +- sqrt(3)}}}