Quadratic equation:
One side of a rectangle is (2x-3) metres, x being a letter not number.
The perimeter of the rectangle is 50.
Show that the area A. of the rectangle is given by A=62x-84-4x^2
The other side = [ 50 - 2(2x -3])] / 2 = 25 - (2x - 3) = 28 - 2x
The area = (2x - 3) (28 - 2x) = - 4x^2 - 6x + 56x - 84 = - 4x^2 + 62x - 84