Question

how to solve this sum please help me

Answer 1

$3 \sqrt{t} + t \sqrt{2} \\ = \sqrt{t} (3 + \sqrt{t} \times \sqrt{2} ) \\ = \sqrt{t} (3 + \sqrt{2t} )$
solution of the polynomial is that value of variable which make polynomial zero
$i.e. \sqrt{t} (3 + \sqrt{2t}) = 0 \\ \sqrt{t} = 0 \: \: or \: \: (3 + \sqrt{2t}) = 0 \\ t = 0$
3 +√2t can never be equal to 0