Book Maths Puzzle Algebra

I have to correct the questions I did wrong on a test. I am not sure what I did wrong. Here is how I did the problem.

3x^2-13x-10

I said (3x-10)(1x-1)

Help!

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Book Other Question

An airplane flew for 8 hours at an airspeed of x miles per hour (mph), and for 7 more hours at 325 mph. If the average airspeed for the entire flight was 350 mph, which of the foll Julie is 21 years older then kathy. in six years julie will be twice as old as kathy. what is the currnet ages?