book Maths Puzzle Numerical Ability

if x=3 and x=-5, then form a quadratic equation. How can I do this to come out right? Thanks

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book Other Question

For the Function f(x)=x^3-12x
Its Local Maximum is the point ( , );
Its Local Minimum is the point ( , ). Addition seems simple enough to me, but the minus/negative numbers confuse me on factoring.

x2 - 6x - 3 = 0