Question

What adds to 12 but multiplies to 9

Answer 1

3x3=9 3+9=12 if thats what youre asking

Answer 2

The numbers are irrational, so they can't be written exactly.
Rounded to the nearest thousandth, they are

11.196
and
0.804 .


11.196 + 0.804 = 12
11.196 x 0.804 = 9.002...