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Juan Set 2 Paper 1 · Q8

Paper 1Functions & graphsNumber & counting

Let aa and bb be real numbers, and let the function ff, defined on the set of real numbers by

f(x)=x3+9x2+ax+bf(x)=x^3+9x^2+ax+b

take positive values for positive real numbers and negative values for negative real numbers.

What is the smallest integer value that aa can take?

A9
B13
C17
D21
E25

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