Question

Write the expression in the standard form a + bi.
i19
a) 1
b) -1
c) i
d) -i

Answer 1

d) -i (i^19= i^16 × i^2 × i = 1 × -1 ×i = -i)

Answer 2

i¹ = i
i² = 1
i³ = -i
i⁴ = 1
i19. =-i