What two integers have a sum of -19 and a product of 84?

Answer 1

-7 and - 12

product = 84

add them to get -19

xy = 84

x+y = -19

2 equations, 2 unknowns, substitute one x value into the other equation and solve

you get a quadratic with 2 answers, x = -7, y = -12 and y=-7, x=-12