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

what are the most often used form of direct deliberate communication of the spoken language

Why are Americans considered to be an “ideologically homogeneous” people?

If the length of one side of a square is 12.0 m, what is the perimeter of the square?

Convert 15/9 to a mixed number and reduce the fraction

how many times does the earth circle around the sun

If you're currently earning $9.25 per hour and you received a 4% increase, what would be your new hourly rate

For whom did the Massachusetts Bay Colony provide a safe religious haven?

whats the prefix in the word unafraid

Why Might Increased Anger About Corruption In Government Lead To Less Interest In Government Attempts To Reconstruct The South

juan has a batting average of 0.334. gary has a batting average of 0.284. what is the difference between the batting averages of the two baseball players?