Numbers that multiply to 36 and add to -60

There aren't any numbers that multiply to 36 and add to -60.

2 * 18 = 36

2 + 18 = 20

-2 * -18 = 36

-2 + -18 = -20

3 * 12 = 36

3 + 12 = 36

-3 * -12 = 36

-3 + -12 = -15

4 * 9 = 36

4 + 9 = 13

-4 * -9 = 36

-4 + -9 = -13

6 * 6 = 36

6 + 6 = 12

-6 * -6 = 36

-6 + -6 = -12

What am i doing here. add?

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