Solve the equation x^4 -2x^3 - 21 x^2 ...

Solve the equation `x^4 -2x^3 - 21 x^2 +22 x + 40 =0`
the roots being in arthmetic progression

A

`2/3,-1/2 ,1,2`

B

`1,+- 2,-3`

C

`+- sqrt(3) , (3)/(4) ,-1/2`

D

`-4,-1,2,5`

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The correct Answer is:

D

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