History of Hindu Mathematics: A Source Book v2.c17.s25.54

v2.c17.s25.54

"Now the products of two and two contiguous of these minus the number-interpolator are the square-roots pertaining to the products of the numbers as increased by 18. So these square-roots are $x² + 3x - 2,$ $x² + 9x + 16,$ $x² + 15x + 52.$