Question

(√21_5-√35_3):(√7_60)

Answer 1

$sqrt{ frac{21}{5} } - sqrt{ frac{35}{3} } = sqrt{ frac{63-175}{15} } = sqrt{ frac{112}{15} } \ sqrt{ frac{112}{15} : frac{7}{60} } = sqrt{ frac{112}{15} * frac{60}{7} } = sqrt{64} =8$