Question

(-5).4-{-√16-[-2³+(12-6-2)²:4+2+3]}q

Answer 1

 (-5).4-{-√16-[-2³+(12-6-2)²:4+2+3]}

 (-5).4-{-4-[-8+(4)²:4+5]}

(-5).4-{-4-[-8+4+5]}

(-5).4-{-4-[+1]}

(-5).4-{-4-1}

- 20 - {-5} ==> - 20 + 5 ==> - 15