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 zeros of the quadratic function f(x) = 6x2 12x – 7?

select the antecedent of the pronoun in the following sentence. The strikers will return to work when the union representative have completed THEIR negotiations

A generalized term for animal organs that produce sex cells is a _____. gametangium antheridium testis gonad

may someone help me out with this please

The first quartile of a data set is 41, and the third quartile is 57. Which of these values in the data set is an outlier? A. 83 B. 39 C. 19 D. 73

Which of the following processes depends on the formation of vesicles and would therefore be blocked?

What code book would be used to code a nosebleed

The angle measure in degrees that corresponds to 7/10ths of a circle is what? a. 63 b.126 c. 252 d. 257/ also, Its corresponding measurement in radians is 7 pie

what is England famous for?

alejandro wants to determine the average shoe size of all of the male students in his school. which sample is likely to yield the most biased results? every ten