exam Maths Puzzle Numerical Ability

Multiply: ((3x^(2/3)) + 2)^2

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Could you please help me find the soultion to this question.

slope: -2;y-intercept (0,4)
Evaluate if r=1/2
(r-3)(r)(r+3)
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(r-2)(r+2)


If anyone can answer this question I would appreciate it very much. Please and Thank You