Question 697473
let side of square be x

3x & x+4 are the new dimensions

Area = L * W

3x(x+4) = 180
3x^2+12x=180
3x^2+12x-180=0

/3
x^2+4x-60=0

x^2+10x-4x-60=0
x(x+10)-4(x+10)=0
(x+10)(x-4)=0

x=-10 OR 4

x cannot be negative
therefore the side of square is 4cm