-1
-7
-13
How about: 4*5*7 = 140
-4 x 5 = -20 and -4 + 5 = 1.
As a product of its prime factors: 3*3*3*11 = 297
3 x 3 x 3 x 11 = 297
396
-1
-7
1, 3, 9, 11, 27, 33, 99, 297.
4 x 13 = 52
-28
-13
How about: 4*5*7 = 140
they multiply to a product
No you don't multiply the 4 numbers you take radius times radius