Any symmetry?
Algebra
Level
3
The equation has .
None of its solution real
All its solutions real but not all positive
Only two of its solution real
Two of its solutions positive, two negative
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1 solution
The concept here is that as plot of f ( x ) = x 2 + 3 x + 4 is entirely above y = x there cannot be any solution for f ( f ( x ) ) = x .