You can
put this solution on YOUR website!I DID NOT COME UP WITH THE SAME ANSWER AS YOU BUT WE ARE FAIRLY CLOSE. MAYBE YOU CAN CHECK BOTH OUR SOLUTIONS----PTAYLOR
In a right triangle, the Pythagorean Theorem states

where c is the hypotenuse and a and b are the respective sides.
Let x= width of rectangle
Then x+1=length of rectangle
We are told that the diagonal or{or hypotenuse of the triangle) is 4 cm. So or equation to solve is:

clear parens

subtract 16 from both sides

quadratic in standard form
Using the quadratic formula:

cm -----------------------------width

------------------------length
I think that we can discount the negative value for x
Hope this helps----ptaylor