book Maths Puzzle Numerical Ability

I need your help on Proportions and Rational Expressions.
Please show your steps, and explain well.
/ will define a fraction, "divided by" is a division symbol... I hope I wrote

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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) Please help, I have tried many ways and seem to not get an answer
the four corners are cut from an 81/2 inch by 11 inch sheet of paper. Corners are 2in find the perimeter of the