Q.

The difference of the irrational roots of the equation x5  5x4 + 9x3  9x2 + 5x  1 = 0 is

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a

5

b

3

c

3

d

25

answer is D.

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Detailed Solution

GivenEquationx55x4+9x39x2+5x1=0isreciprocalEquationx=1isroot

Question Image

x44x3+5x24x+1=0x24x+54x+1x2=0(x2+1x2)4(x+1x)+5=0Letx+1x=yx2+1x2=y22y224y+5=0y24y+3=0y23yy+3=0(y1)(y3)=0

y=1,  y=3Ify=1thenx+1x=1x2x+1=0x=1±142=1±i32Ify=3x+1x=3x23x+1=0x=3±942=3±52Differenceofroots=3+52(352)=5

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