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

2. What is migration? What are some reasons why people migrated out of Africa? Think about the environment and animals- see page 5 of the lesson.

1) Two coins are to be flipped. The first coin will land on heads with probability .6, the second with probability .7. Assume that the results of the flips are

simplify : (x^-2y^-4x^3)^-2

−2x+30>4x+12-2x+30>4x+12 Express the set using interval notation.

HIV be transmitted by: urine in a cut on the skin

A rocket with a total mass of 330,000 kg when fully loaded burns all 280,000 kg of fuel in 250 s. The engines generate 4.1 MN of thrust. What is this rocket's s

This type of muscle works by helping the agonist so that it can act more efficiently.

According to Malcolm X, what are “Uncle Toms” and how do they slow progress for blacks in America?

A gray kangaroo can bound across level ground with each jump carrying it 9.6 m from the takeoff point. Typically the kangaroo leaves the ground at a 28º angle.

Females who lift weights are not going to develop large, bulky muscles because __________. A. they have more muscle fibers than men B. they have thicker muscle