Posted by Lee on Saturday, November 3, 2012 at 11:18am.
recall that (a+bi)(a-bi) = a^2+b^2
to get that pesky complex number out of the denominator, multiply by (-5-i) top and bottom:
(-6+i)(-5-i)/(-5-i)(-5+i)
= (30 - 5i + 6i - i^2)/26
= (31 + i)/26
= 31/26 + 1/26 i
thank you
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