exam Maths Puzzle Numerical Ability

solve for x:

5x^3 - 30x^2 + 45x = 0

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exam Other Question

I am not understanding multiplying radical expressions:

(2-3 cubed root 7) (5+2 cube root 7)
evaluate the function at the specified values of the independant varible and simplify:
f(x)sqrootx+8endsqroot+2
please help
thanks