exam Maths Puzzle Numerical Ability

I need to find the real solutions of this:
x^3-5x^2+8x-4

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exam Other Question

Express
_
2/2 3
---- - ----
_ _
/3 2/6

in simplified radical form. Convert this inequality into an equation by adding a slack variable.
2x1 + 4x2 + 3x3 ≤ 100

Is this correct? 2x1 + 4x2 + 3x3 s1 = 100

Thank you so much for reviewing