Number of real roots of equation (x+1) (x+2) (x+3) (x+4) -8 =0 is
A
0
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B
2
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C
4
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D
3
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Solution
The correct option is A 0 (x+1)(x+2)(x+4)=8x4+103+35x2+50x+16=0FromOescantesruleofsignofsignTherewillbenopositiverootsf(−x)=x4−10x3+35x2−50x+60=0andposibilityofnegativerootsand0,2or4butnonegativenumbermakingthisequation′0′soithasnorealroots