lucashoxuanying lucashoxuanying
  • 01-03-2021
  • Mathematics
contestada

if x-y=9,x²+y²=27,then xy=?​

Respuesta :

jimrgrant1 jimrgrant1
  • 01-03-2021

Answer:

xy = - 27

Step-by-step explanation:

Note that

(x - y)² = x² - 2xy + y² ← substitute given values, that is

9² = 27 - 2xy

81 = 27 - 2xy ( subtract 27 from both sides )

54 = - 2xy (divide both sides by - 2 )

- 27 = xy

Answer Link

Otras preguntas

Select ALL the correct answers. These cartoons both depict both William McKinley and the concept of prosperity during the campaign for the presidency in 1896. N
What are two ways that Africans were discriminated against by the white government?
Why does John Proctor ultimately renounce his confession and tear it up? O A. Because he wants to die honorably and with his good name intact O B. Because he wa
Will mark as the brainliest!
7. What rational number is exactly halfway between and 1/7 1/8
hey girl and boy heyyyyyy
what do you think of when you see the american flag
change the sentence into question. titi goes to school every morning​
What word does the author use to indicate his feeling of the story the right to fail by William zinsser
6. a) Find the slope of the lines that pass through the following points: (6, 1) and (-2,5) 2 -2 1/2 -1/2