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

Question 4 of 32 Which of these strategies is least likely to help you manage stress? A. Reward yourself for successes. B. Squeeze a stress ball when stressed.

Validate that the user age field is at least 21 and at most 35. If valid, set the background of the field to LightGreen and assign true to userAgeValid. Otherwi

John F. Kennedy, Jr. crashed his airplane as a result of being disoriented while flying in marginal weather conditions at night. In order to reduce the risk of

Mr. Kumar is considering a Medicare Advantage HMO and has questions about his ability to access providers. What should you tell him?

What did Caravaggio enjoy painting the most?

Read and choose the correct option. Si se da usted un golpe en la cabeza, puede escuchar las recomendaciones del doctor: Cuídese mejor si quiere sanar. Descanse

Use the theoretical method to determine the probability of the outcome or event given below. The next president of the United States was born on Monday

anyone have sna pc hat ?? mine is rince9253

question: A sequence is defined by the recursive function f(n + 1) = –10f(n).If f(1) = 1, what is f(3)?3–30100–1,000the answer is 100

Select the correct answer. During which stage of fetal development do the heart and lungs of a fetus become fully developed and functional? A. first trimester B