Question 694167
(x+5) (x-5)=39
x^2-5x+5x-25=39
x^2-25=39
x^2-64=0
x^2-8x+8x-64=0
x(x-8)+8(x-8)
(x+8)(x-8)
x=-8 or x=8
8+5=13, 8-5=3, -8+5=-3, -8-5=-13,
you can not have a negative number as a length or width, so x=8
Length=8+5
Width=8-5
Length=13
Width=3