Question 295323
{{{2x^4-10x^2=0}}}
{{{2x^2(x^2-5)=0}}}
{{{2x^2(x-sqrt(5))(x+sqrt(5))=0}}}
Three solutions:
{{{x=0}}}
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{{{x-sqrt(5)=0}}}
{{{x=sqrt(5)}}}
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{{{x+sqrt(5)=0}}}
{{{x=-sqrt(5)}}}
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Verify graphically
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{{{ graph( 300, 300, -5, 5, -5, 5, 2x^4-10x^2) }}}