History of Hindu Mathematics: A Source Book v2.c17.s25.18

v2.c17.s25.18

"Here let the two numbers be 5z², 4z². *They are assumed such as will make their sum and difference both squares.* Their product is 20z⁴. This must be a cube. Putting it equal to the cube of an optional multiple² of 10z and removing the common factor z³ from the sides as before, (we shall ultimately find) the numbers to be 10000, 12500."