Question 154287
let s="side of square"


"two opposite sides of a square are increased by 10 meters" __ s+10


"the other sides are decreased by 8 meters" __ s-8


"the area of the rectangle that is formed is 63 square meters" __ (s+10)(s-8)=63


FOILing __ s^2+2s-80=63 __ subtracting 63 __ s^2+2s-143=0 __ factoring __ (s+13)(s-11)=0


s+13=0 __ s=-13 __ negative value not realistic


s-11=0 __ s=11 __ area=11^2=121