book Maths Puzzle Numerical Ability

For the Function f(x)=x^3-12x
Its Local Maximum is the point ( , );
Its Local Minimum is the point ( , ).

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book Other Question

A school has three clubs, and each student is required to belong to exactly one club. One year the students switched club membership as follows:
Club A: 4/10 remain in A, 1/10 sw if x=3 and x=-5, then form a quadratic equation. How can I do this to come out right? Thanks