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Question

If z1z2C,z21+z22ϵR,z1(z213z22)=2 and z2(3z21z22)=11, then the value of z21+z22 is

A
10
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B
12
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C
5
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D
8
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Solution

The correct option is C 5
We have,
z1(z213z22)=2 (1)
z2(3z21z22)=11 (2)
Multiplying (2) by i and adding it to (1), we get
z213z22z1+i(3z1z2z2z32)=2+11i
(z1+iz2)3=2+11i (3)
Multiplying (2) by i and subtracting it from (1), we get
z313z22z1i(3z21z2z32)=211i
(z1iz2)3=211i (4)
Multiplying (3) and (4), we get
(z21+z22)3=22121i2=4+121=125
z21+z22=5

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