Express (4 - 5i)(5 + 5i) in the form a + bi where a and b are integers and i^2 = -1.
+2668 Distribute the equation, and you get 20+20i−25i−25i2
After simplifying, you get: −25i2−5i+20
Substitute -1 for i2: (−25)(−1)−5i+20
Simplify again, and we find that the answer is: −5i+45
