Question 947222
{{{x^4=49}}}
{{{x^4-49=0}}}
{{{(x^2-7)(x^2+7)=0}}}
{{{(x-sqrt(7))(x+sqrt(7))(x-sqrt(7)i)(x+sqrt(7)i)=0}}}
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{{{x=sqrt(7)}}}
{{{x=-sqrt(7)}}}
{{{x=sqrt(7)i}}}
{{{x=-sqrt(7)i}}}