What multiplies to negative 112 and adds up to 3?

Answer 1

115

Answer 2

xy = -112

x + y = 3

x = 3-y

y(3-y) = -112

3y - y + 112 =0

-y + 3y + 112 = 0, which has no simple factorisation. Use the quadratic formula:

x = [-b +- sqrt(b - 4ac)]/2a

x = [-3 +- sqrt(457)]/-2

Case one:

x = 3/2 + sqrt(457)/2

x ~ 12.1888

Case two:

x = 3/2 - sqrt(457)

x ~ -9.1888

So x and y = 12.188 and -9.1888.