Evaluate:
(4+3i) + (5+4i) =
(4+3i) - (5+4i) =
(5+4i) - (4+3i) =
(4+3i) * (5+4i) =
(4+3i) * (4-3i) = Product of a pair of complex conjugates.
(5+4i) * (5-4i) =
3i * 4i = Product of two pure imaginary numbers.
5i * 2i =
-5i * 2i =
-5i * -2i =
(4+3i) / (5+4i) =
(5+4i) / (4+3i) =
i³³ =
i³⁴ =
i³⁵ =
i³⁶ =

Use quadratic formula to solve:
x² + 4 = 0
Solutions: x=±
Check: (x+____)(x-___) =

x² + 9 = 0
Solutions: x=±
Check: (x+____)(x-___) =