book Maths Puzzle Numerical Ability

on page 303 exercise 24-33 can you help me?

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book Other Question

If f(x) = x(x – 1)(x – 4)2, use interval notation to give all values of x
where f(x) > 0.
How do I solve this problem?

b / b - 1 + 2b / b^2 - 1