Shannif7ranuel
Shannif7ranuel
01-12-2016
Mathematics
contestada
2 numbers sum is 7 product is -18
Respuesta :
BobR9
BobR9
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
VER TODAS LAS RESPUESTAS ( 44+ )
Otras preguntas
a way to represent the block? choose yes or no 300 hundred 30 one 30 hunderd 30tens
HELP! 10 PPPPPPOOOOOIINNNNNNTSS!! :)
) A scientist who is researching marshes observes that marsh grass, Spartina bakeri, grows to different heights at different locations in the marsh. If the scie
Which statements describe a method kings and queens of Northern Europe used to gain power
An aquarium tank holds 190 liters of water. How much is this in gallons? Use the following conversion: 1 gallon is 3.8 liters.
s(t)=16t^2+32t, how long will it take the ball to fall 79 feet?
Please help I am in need of your help. I will name you brainliest if you answer all of the questions. 1. What allowed settlers to establish a colony in Texas? 2
incomplete proteins do not satisfy the suggested daily intake of protein; only complete proteins do.true or false
Are the ocean and present atmosphere leftovers from the original atmosphere of earth?
one third of a number subtracted from 17. as an expression
