Q.

Two complex numbers a and β are such

 that α+β=2 and α4+β4=272, then the quadratic equation 

 whose roots are α and β can be 

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a

x22x16=0

b

x22x+12=0

c

none of these

d

x22x8=0

answer is C.

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Detailed Solution

          α+β=2α2+β2+2αβ=4
 α2+β2=42αβα2+β22=1616αβ+4α2β2 α4+β4+2α2β2=1616αβ+4α2β2 272+2(αβ)2=1616αβ+4(αβ)2 2(αβ)216(αβ)256=0 (αβ)28(αβ)128=0 (αβ16)(αβ+8)=0 αβ=16 or αβ=8

Thus, required equation is either

or       x22x+16=0x22x8=0

 Required answer is (c).

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