Rectangular Garden Quadratic Formula

[17rkearns]

OK I have no idea where to start... again...
I have to turn the word problem into quadratic formula and solve it.

Mr. Kop wants to create a rectangular garden that is 2 feet less than twice the width and he wants it to be 420 feet squared. What must the dimensions be?

 

[Bob Brown MSEE]

OK I have no idea where to start... again...
I have to turn the word problem into quadratic formula and solve it.

Mr. Kop wants to create a rectangular garden that (has a length which) is 2 feet less than twice the width and he wants it to be 420 feet squared. What must the dimensions be?

L*W=420 ft²
L=2W-2