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

Solve using Matlab the problems: One using the permutation of n objects formula One using the permutation of r objects out of n objects You can pick these prob

Can someone please help me with writing a flowchart proof?

Is it the best if you take Advil with a burning throat?

what is tue cause of upthrust ?

What unit of measurement would you use to measure the capacity of a juice box?

explanation would be appreciated. i don’t understand

A substance freezes at 25 degree celcius and boils at450 degree celcius at what temperature will the subsancehave a definate shape and a defnate volume

At the movie theatre, child admission is $5.80 and adult admission is $9.70. On Wednesday, 171 tickets were sold for a total sales of $1296.00. How many child t

Solve for e 16-3e=7/5e+11.6

What is the correct IUPAC name for Ir(NO₂)₄