163
1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120:1 x 120, 2 x 60, 3 x 40, 4 x 30, 5 x 24, 6 x 20, 8 x 15, 10 x 12.
40 x 3 = 120, 40 + 3 = 43.
You multiply them.
There are four factor pairs of 40 totaling 13, 14, 22 and 41, none that total 18.
The first 12 are: 60, 120, 180, 240, 300, 360, 420, 480, 540, 600, 660 . . .
2 and 4
104
113
120
-134
154
120
-1 and -120
1
154
Multiply each one by each of the others (separately), add them together and multiply by 2. 140*120=16800 140*4=560 120*4=480 16800+560+480=17840 17840*2=35680 units squared
None of the factor pairs of 120 add up to -14. If that was -120, you could use -20 and 6.
You could multiply the 146 by 2 to give 292 and as 20 is 10 tens 2, just add a zero at the end of that, to give 2920.
-6 and -20