Complex numbers

The value of √(-144) is

• 12i

• -12i

• ±12i

• None of these

The modulus of 5 + 4i is

• 41

• -41

• √41

• -√41

The value of i ^-999 is

• 1

• -1

• i

• -i

• 2

• 1

• 5

• 8

solve

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If a + ib = c + id, then

• A² + c² =0

• B² + c²=0

• B²+D²=0

• A²+B²=C²+D²

• x= 2n+ 1

• x= 4n

• x=2n

• x=4n +1 , where n ∈ N

• -2

• 2

• 1

• -1

• i

• -i

• 1

• None of the above

• -15

• -16

• -13

• -19