exam Maths Puzzle Numerical Ability

I got one more that is giving me problems! HELP PLEASE!! THANK YOU!

(2x/2x)(3x/5x)
/=the radical sign

Thanks in advance!
ac

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exam Other Question

3
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4b-9
I have a final tomorrow and this question is on the review.
Factor completely:
x^3+x^2-25x-25