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 ( 33+ )
Otras preguntas
If you’re aerobically fit, you can A. lift very heavy weights without injuries to your joints. B. run a marathon without experiencing fatigue. C. sustain a regu
Write a real-world word problem in which the unit rate is 6 miles per hour.
what makes washingtion DC one of the most important cites in the world?
4|x+5|=20 Thanks for the help
explain 1 way to add 3 digit numbers
After a bill has been introduced, what happens next? It is debated on the floor. It is sent to the other house. It is reviewed in committee. It is approved b
which is an example of how ecosystems on earth affect each other
Which major world religion teaches that people will achieve freedom by following the Eightfold Path? a. Buddhism b. Christianity c. Islam d. Judaism
How were marriages arranged in medieval European society?
Why were Europeans interested in exploration in the fifteenth and sixteenth centuries?
