Arectangular plot of ground is 30 meters longer than it is wide it's area is 15000 square meters which equation will me find the dimensions

The plot: x meters wide and (x+30) meters long with an area of 15000 m^2. the equation you're searching for is:

x meters * (x+30) meters = 15000 m^2 or

x^2 + 30x m^2 = 15000 m^2 and

x^2 + 30x - 15000 = 0 <== that's the equation.

ans: x^2 + 30x - 15000 = 0

The correct answer is $90