exam Maths Puzzle Numerical Ability

I am not understanding multiplying radical expressions:

(2-3 cubed root 7) (5+2 cube root 7)

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exam Other Question

A.how many 12 inch square tiles would be necessary to cover the floor of a square room that measures 14 feet on a side? solve for x:

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