The modulus of -2 + 4i is
5√2
5/√2
2√5
√5
If Z is a complex number such that , then
z is purely real
z is purely imaginary
z is any complex number
real part of z is the same as its imaginary part
If Z1=2 + i, Z2 = 3 - 2 i and Z3 = -1/2 + √3/2 then the conjugate of z1z2 is
i
8 + i
8 - i
6 - i
If (3+i) z = (3-i) , then the complex number z is.
a (3-i), a∈R
, a∈R
a(3+i), a∈R
a (-3 + ), a∈R
The number of non-zero integral solutions of the equation |1-i|x = 2x is represented on the y axis (imaginary axis)
infinite
1
2
None of these
If Z1 = √2 ( cos π/4) and z2 = √3 (cos π/3 + i sin π/3 ) then |z1z2| is
6
√2
√6
√3
If , then is (where is complex conjugate of z).
2 (1 + i)
(1+i)
Find the real and imaginary part of (2+i) (3-2 i)
8,1
-8,1
8,-1
-8,-1
Let z1 be a complex number with |z1| = 1 and z2 be any complex number, then
0
-1
Express in the standard form a+i b: ((-3+i) (4-2 i)
10+10 i
-10 -10 i
-10 + 10 i