Question 1116506
already know  (h+k)(a+b)=ha+ka+hb+kb, and  i^2=-1


Just follow that and do the simplifications.



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{{{7*8-16i-21i+6i^2}}}
{{{56-37i+6(-1)}}}
{{{56-6-37i}}}
{{{highlight(50-37i)}}}