book Maths Puzzle Numerical Ability

How do I begin factoring the following equation : (x+5)*3 + (x-5)*3 . * represents the power. I know the answer.

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book Other Question

A small jet few at a rate of 75 mph. The trip was 225 miles. How long did the jet fly. Thanks My question says to simplify the radical
(radical sign 6 - radical sign 5)(radical sign 6 + radical sign 5)
Thank you