Express each of the complex number given in the Excercise 1 to 10 in the form a + ib.
i9 + i19
i9 + i19 = i8.i +i18.i = (i2)4.i. (i2)9.i
= (-1)4 .i + (-1)9 .i (use i2 = -1)
= i - i = 0
i-39
t-39 =