exam Maths Puzzle Numerical Ability

1) F(x)=-x^5+3x^3-x round to three decimal places
I need to estimate the relative maxima and minima of the polynomial function
I got minima -1.57 and maxima 1.57 but i'm not sur

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exam Other Question

Perform the indicated operations

(-1/5)power of 3 {(-1/3)power of 2 + 1/12(1/6 - (-1/4)power of 3)} the sum of three consecutive odd integers is the same as the smallest of these integers. what are the smallest of the integers and what is the greatest of these integers?