Question 336734
{{{q(x)=x^4-10x^2 + 9=0}}}
{{{q(y)=y^2-10y+9=0}}}
{{{q(y)=(y-1)(y-9)=0}}}
You can then substitute back,
{{{q(x)=(x^2-1)(x^2-9)=0}}}
Use the zero product property to find the 4 solutions in x.
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{{{graph(300,300,-4,4,-40,40,x^4-10x^2+9)}}}