Take 13 and 17 as an example. Sum is 13 + 17 ie 30, product is 13 x 17 = 221
55
43
15 and 2
9 and 8
Sub divide 8x into the cross product after reducing 42/1 to a polynomial for an answer of 17.
Their product.
(6 * 30) + (15 * 42) = 180 + 630 = 810.
18 and 24.
6 and 7
12
Take 13 and 17 as an example. Sum is 13 + 17 ie 30, product is 13 x 17 = 221
55
18 and 24
10 and 7
7 and 6
32 + 20 = 4 x (8 + 5)