<PRE><B>Question 685005</B>
(3-7i)(3-7i)
Foil
3(3) + 3(-7i) - 7i(3) - 7i(-7i)
{{{9 - 21i - 21i + 49i^2}}}
knowing {{{i = sqrt(-1)}}} and {{{i^2 = sqrt(-1)^2 = -1}}}
9 - 42i + 49(-1) 
9 - 42i - 49
{{{highlight_green(-40-42i)}}}


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