book Maths Puzzle Numerical Ability

How do i solve this in synthetic division (x to the third power plus x to the second power minus threex plus four)divided by (x minus three)

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Trying to answer this: -X over 2 + 4=12 -x/2+4=12 Can you please explain the work on how to do this A car travels 120 miles. A second car, going 10mph faster than the first, makes the same trip in 1 hour less time. Findthe speed of each car. I know to use D=rt, but I'm not sur