The area of a circle is 616 cm2 . The length of the rectangle (l) is twice the radius (r) of the circle. The perimeter of the rectangle is 10 cm more than the circumference of the circle. 'b' is the breadth of the rectangle.

Equation (i) ax² - 42x + (r + l) = 0

Equation (ii) zy² - 35y + (b + r) = 0

If the bigger roots of equation (i) and equation (ii) are 14 and 7 respectively and if both the given equations have one common root then find the value of (a² + z² - 2az) ?