Help me please

Hi,

im trying to get my head round the bisection method to create a
script file to do the following but im struggling. please someone
give me a hand or get me started......

find the positive zero of the continuous function
f(x)=2.1x^3-cos(1.5x)
the zero should then be determined to 4 decimal places....

file needs to:
1.)request the user to enter the initial endpoints of the zero
2.)Verify that the interval entered is valid (i.e. contains a 0) -if
not warn the user
3.)Display the zero on the screen

thanks in advance
.

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