book Maths Puzzle Numerical Ability

Determine the maximum number of zeros of the polynomial function:
f(x) = 3x2 - 2x - 2x3 - 3

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book Other Question

Gail is a srever at a restaurant. ON saturday Gail gets up at 6.30.a.m, atrats work at x a.m & finishes at x p.m. How long does Gail work on saturday? I do not understand how to do this. I have gone over it several times and cannot figure out the process. I need to decide all values of b that will give one or more real number s