Question 876196
(10+x)*(13+x) = 208



130+10x+13x+x^2 = 208



x^2+23x+130 = 208



x^2+23x+130-208 = 0



x^2+23x-78 = 0



(x-3)(x+26) = 0



x-3=0 or x+26 = 0



x = 3 or x = -26



Toss out the negative solution



x = 3 is the only practical solution



New Width: 10+x = 10+3 = 13



New Length: 13+x = 13+3 = <font color="red">16</font>