Question

$3 sqrt{2 frac{1}{3} } - sqrt{x84} - sqrt{5frac{1}{4}}$

Answer 1

$3 sqrt{2frac{1}{3}}-sqrt{84}-sqrt{5frac{1}{4}}=3sqrt{frac{7}{3}}-2sqrt{21}-sqrt{frac{21}{4}}=sqrt{21}-2sqrt{21} -frac{1}{2} sqrt{21}=-1frac{1}{2} sqrt{21}$