Question 98767
let x= the fraction
{{{4x^2/5=1/5}}}
by inpection of the formula: {{{4x^2=1}}}
{{{x^2=1/4}}}
take sqrt of both sides: x=1/2 Ans. and -1/2 (-1/2 is extraneous)
Check:
(1/2)*(1/5)=1/10
1/10*4=4/10=2/5
(2/5)*(1/2)=2/10=1/5
Ed