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factorise it and find zeros and use tabe

table method not tabe

@sauravshakya what is the table method?

table method: sit down at the table with pencil and paper :)

I will do for easy one ok
suppose |dw:1344005362435:dw|

can you find the zeros then use synthetic division to reduce it to a smaller factor?

here |dw:1344005426187:dw|

can you use calculus?

no

x^4 + .... has the shape|dw:1344005576425:dw|
knowing the min and max parts would be useful

|dw:1344005474076:dw|
now using table
|dw:1344005508829:dw|

so from the table we get|dw:1344005614786:dw|

got it @strawberry_militia

use this similar method to solve your question @strawberry_militia

well, a quick trial and error gives me one zero:
f(0) = 6
f(1) = 0

that should reduce it to a cubic

I have found the factors.

then plot them on a number line and take test point between the zeros to determine signage

write down the factors in coordinates form
like
if the four factors are a,b,c,d
and a**
**

to -inf and +inf should be positive just by the nature of the poly

so when you get a positive value..that is your required range

I will try it out. thanks for all your responses.