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

Choose an example of a fixed expense and an example of a variable expense, and explain why they are classified that way.

Complete the sentence with the word or phrase that has the most positive connotation.When we saw her barefoot and wearing flowers as a crown, we knew the girl w

explain the importance of the water potential comcept in plant physiology

Bobby is riding his bike down the road at a speed of 10 miles per hour. Ahead of him, he sees another rider, moving in the same direction. Bobby is catching up

The Supreme Court based its 1883 decision about civil rights on an interpretation of the Thirteenth Amendment. the Fourteenth Amendment. the Fifteen

“Frogs are never red.” This is an absolute statement. Please select the best answer from the choices provided T F

what is the factored form of the expression? 4x^2-81y^2

The element that has the most important effect on the weldability of common gray cast iron is? A. copper B. Carbon C. Steel D. Sulphur

Culture is ____ a factors in world conflict

Bacteria more easily adapt to changing environments than elephants because bacteria __________.