Shannif7ranuel Shannif7ranuel

01-12-2016
Mathematics

contestada

2 numbers sum is 7 product is -18

Respuesta :

01-12-2016

x+y=7
x•y=-18

x+y=7
x=7-y

x•y=-18
(7-y)•y=-18
7y-y^2=-18
-y^2+7y+18=0
Y^2-7y-18=0
(y-9)(y+2)=0
y is either 9 or -2

x+y=7
x=7-y
X=7-9
X=-2

X•y=-18
9•(-2)=-18
-18=-18

There you go, y is 9 and x is -2

Answer Link

Otras preguntas

34. A MasterCard statement shows a balance of $510 at 13.9% compounded monthly. What monthly payment will pay off this debt in 1 year 4 months? (Round your answ

4.D.15 Consider a student loan of $17,500 at a fixed APR of 6% for 25 years. a. Calculate the monthly payment. b. Determine the total amount paid over the term

A motorcycle is moving at 15 m/s when its brakes are applied, bringing the cycle to rest in 5.3 s. To the nearest meter, how far does the motorcycle travel whil

What percent of the surface of the earth is covered with water ? A. 100 % B. 0 % C. 70 %

What are the Clusters of 3?

Helppppppppppppppppppping

A function that is called or summoned into action by its reference in another function is a ____. A) function prototype B) called function C) calling function D

how to ensure that the child is up to date with their immunization

How do societal attitudes of developed countries differ from those of undeveloped countries?

Omega Instruments has budgeted $300,000 per year to pay for certain ceramic parts over the next 5 years. If the company expects the cost of the parts to increas