Question 363154
What if you did a substitution, 
{{{u^2-7u+10=0}}}
How would you find the zeros??
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You can factor,
{{{x^4-7x^2+10=0}}}
{{{(x^2-2)(x^2-5)=0}}}
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{{{x^2-2=0}}}
{{{x^2=2}}}
{{{highlight(x=0 +- sqrt(2))}}}
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{{{x^2-5=0}}}
{{{x^2=5}}}
{{{highlight(x=0 +- sqrt(5))}}}