Q2 of 29 Page 5

Express i9 + i19 in the form of a + ib.

i9 + i19 = (i4)2 i + (i4)4 i3


As i4 = 1,


= i + i3


Also, i3 = - i


= i – i


= 0


More from this chapter

All 29 →
1

Evaluate i - 999.

 3

Find values of x and y if, (3x – 7) + 2iy = –5y + (5 + x)i

 4

Multiply 4 - 3i by its conjugate.

 5

Find the modulus of 3 + 5i.