What two numbers add up to 7 and multiply to get -504?

Xy=-504
x+y=7
subtract y from both sides
x=7-y
subsitute 7-y for x
(7-y)(y)=-504
7y-y^2=-504
add (y^2-7y) to both sides
0=y^2-7y-504
use quadratic formula which is
x= subsitute
ax^2+bx+c
a=1
b=-7
c=-504
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