square root of 2 over 5 end root equals fraction numerator square root of 2 over denominator square root of 5 end fraction equals fraction numerator square root of 2 over denominator square root of 5 end fraction x space fraction numerator square root of 5 over denominator square root of 5 end fraction equals fraction numerator square root of 2 space x space square root of 5 over denominator 5 end fraction equals 1 fifth square root of 10