the hypotenuse may be found by using the Pythagoras theorem
Simply collect all the like terms together
So..3+5+14 is 22x
-1^3 - -1^2 +1= -1. ...........
Area of Rectangle = length times width
lets say length = 2x-4
width = x+5
Note: you can switch these around, width could be 2x-4 and length could be x+5, it doesnt matter.
With that being said:
length * width = area
(2x-4)(x+5)=area
FOIL (First Outer Inner Last)

Simplify: