Question

Just need help with this

Answer 1

`√(-81)\implies √(81\cdot -1)\implies √(81)\cdot √(-1)\implies 9\cdot √(-1)\implies 9i\implies \stackrel{\textit{\LARGE a}}{0}+\stackrel{\textit{\LARGE b}}{9i} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ √(-9)\implies √(9\cdot -1)\implies √(9)\cdot √(-1)\implies 3\cdot √(-1)\implies 3i`