Question 1182156
Original length and width,  4x and 3x


New dimensions, 4x+5  and 3x+5
Increased area, 200 sq. in.s


{{{(4x+5)(3x+5)-4x*3x=200}}}
-
{{{12x^2+15x+20x+25-12x^2=200}}}
{{{35x=200-25}}}
{{{35x=175}}}
{{{highlight(x=5)}}}



original dimensions,  20 and 15