book Maths Puzzle Numerical Ability

I need to add and subtract this polynomial.
(3x*+5x-8)+(5x*+9x+12)-(x*-14) All * mean to the 2nd power.

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book Other Question

Hello. The problem is cube root of 10/9x^2. I have come up with the cube root of 30x/3x. Can someone please verify if I have the correct answer? Thanks in advance. a^2(ab^2)^2