Question

1) √ 21 /√12 =
2) √ 12-3√ 3 =

Answer 1

$frac{ sqrt{21} }{ sqrt{12} } = frac{ sqrt{3*7} }{ sqrt{3*4} } = frac{ sqrt{3} sqrt{7} }{ sqrt{3} sqrt{4} } = frac{ sqrt{7} }{ 2 }$

$sqrt{12} -3 sqrt{3} = sqrt{4*3} -3 sqrt{3} =2 sqrt{3} -3 sqrt{3} =- sqrt{3}$

Answer 2

1) √ 21 /√12 =√21/12=√7/4=√7/2
2) √ 12-3√ 3 =2√3-3√3=-√3