exam Maths Puzzle Numerical Ability

A rectangle has an area of X^3 - 6X^2 + 15X - 28 square feet. Its width is X - 4 feet.

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I have to do a powerpoint by tomorrow that includes #28 (the proof) on pg. 219 in the upper right hand corner. I have the statements typed out already, but I need to know what the Please help!

(5x+4)^1/2-3x=o