Explanation:
x * y = 48
x + x + y + y = 32 These are 'given'
y = 48 / x from the firt equation.....sub into second equation
x + x + 48/x + 48/x = 32 simplify a bit to
2x + 96 / x - 32 = 0 multiply by 'x ' to get
2x^2 -32x + 96 = 0 now factor ...or use Quadratic Formula to find
x = 12 then y = 4
the rectangle length and width are 12 and 4 or 4 and 12 feet