Sweden | A Nice Algebra Problem

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[edstudio]

Nice ! I like what you are doing in your videos : great concepts

[VitalijsSeins-wttf]

I divided denominator and nominator at 7^x . So we got . I've made the substitution 7^(8-x)=a So we got sqrt((1+a)/ (a^(-1)+1))=7^2 => sqrt((a+1)*a)/(a+1))=7^2=> sqrt(a)=7^2 => a=7^4 or t^(8-x)=7^4 => 8-x=4=>x=4
Quite simple problem.