Q.

The sum of the cubes of all the roots of the equation x4-3x3-2x2+3x+1=10 is _________

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answer is 36.

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Detailed Solution

x43x32x2+3x+1=10

x=0 is not the root of this equation so divide it by x2

x23x2+3x+1x2=0x2+1x22+23x1x2=0x1x23x1x=0x1x=0, x1x=3x21=0, x23x1=0x=±1, γ+δ=3α=1,β=1 γδ=1α3+β3+γ3+δ3=11+(γ+δ)(γ+δ)23γδ0+3(93(1))=3(12)=36

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