Question

$sqrt{1 + sqrt{4 + sqrt{25} } }$

Answer 1

$sqrt{25} =5, sqrt{4+5} = sqrt{9} =3, sqrt{1+3} = sqrt{4} =2$

Answer 2

=$sqrt{1+ sqrt{4+ sqrt{25} } }= sqrt{1+ sqrt{4+5} }= sqrt{1+3} =2$