Question 699037

^ does not mean square root, means exponent, but I believe that you here need square root

{{{(5+sqrt(-9))+(7-5i)}}}

{{{(5+sqrt((-1)*9))+(7-5i)}}}......recall that {{{sqrt(-1)=i}}}

{{{(5+3i)+(7-5i)}}}

{{{5+3i+7-5i}}}

{{{(5+7)+(3i-5i)}}}

{{{12-2i}}}