Express (4-5i) (-5-5i) in the form a+ bi, where a and b are integers and i^2 = -1
(4-5i) (-5-5i) expand
-20 -20i +25i + 25i2 simplify (remember i2 = - 1 )
-20 -25 -20i+25i
-45 + 5i
+37159 
