Write the value of 
= 5i×3i
= 15i2
= -15
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13. Complex Numbers
1
2
3
3
3
3
3
3
3
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
3
3
3
3
3
3
4
4
4
4
5
6
7
8
9
10
11
12
13
14
15
16
16
16
16
16
17
18
19
20
21
22
23
24
25
26
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
3
3
3
3
4
5
6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
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