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
I need help solving these two problems on Radicals:
1. Radical 18 + Radical 12 + Radical 8 =
2. 3 radical 7 - 2 radical 28 = {{{ 8 / cube root of 16 }}}