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

I NEED HELP!! What industry was the Homestead Strike of 1892 apart of and what happened?

What is the expression?

What contributed to the growth of major cities in the Sahel, such as Timbuktu, between the tenth and fifteenth centuries? A the highly productive coal mines loc

What happens at a tectonic plate boundary? A. Sea Floor Spreading Takes Place. B. An oceanic plate becomes a continental plate. C. Two Tectonic Plates interact

Please help quickly 4x(3a + b + ab)

GPA Scale: A - 4.0 pts B - 3.0 pts C - ? pts D - 1 pt F - 0 pt How many points is a grade points is a C? THIS IS FROM MY COLLEGE CAREER CLASS ANYONE HELP

What should you do as a passenger on the boat full of innocent citizens? If one were to push the button and blow up the prisoners, what might that say about the

Help, please Dictatorships will sometimes protect their power by using the following: military action, _______, propaganda, and state-sponsored terrorism. pos

I’m stuck on this one. Can any one help me?

Write an essay for your school newspaper arguing whether playing video games significantly affects physical health. Your essay must be based on the ideas, conce