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3x - 4x3 <= 1
i.e., f(x)=4x3 - 3x -1 >= 0
for x=-1, f(x)= 0 , so (x+1) is a factor , the other factors are (2x+1)
f(x)=(x+1)(2x+1)2 >=0
as (2x+1)2 is always positive
domain is (x+1)>=0
or x lies in [-1 , infininty)
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Regards
Ramesh
domain of any polynomial function is from -infinity to +infinity
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