The sum of two numbers is 12. the product of those same two numbers is -64. find the numbers

Let the first number be x
let the second number be y
therefore, x+y=121
and x×y=-642
factors of 64 include
1 and 64,
2 and 32,
4 and 16 
here we find out that 16+-4=12 and that 16×-4=-64
∴, x=16
and y=-4
please mark as brainliest

The answer is c. 7 (i think) i’m almost sure though