Hi there!
[tex]\large\boxed{-40 + 20i}[/tex]
Recall the rules for the imaginary number "i":
i = √-1 i² = -1
Given:
(5i) (5i) + (5i) (4 + 3i)
Multiply:
(25i²) + 20i + 15i²
Simplify using the rule above:
25(-1) + 20i + 15(-1)
-25 + 20i - 15
-40 + 20i
a = -40
b = 20
