Ronly
Ronly
30-09-2017
Mathematics
contestada
If x+y+z=9 and xy+yz+zx=26 then find x^2+y^2+z^2
Respuesta :
caylus
caylus
30-09-2017
Hello,
[tex](x+y+z)^2=x^2+y^2+z^2+2xy+2yz+2xz\\\\
x^2+y^2+z^2=(x+y+z)^2-2*(xy+yz+xz)\\\\ =9^2+2*26=81-52\\\\ \boxed{=29} [/tex]
Answer Link
VER TODAS LAS RESPUESTAS ( 37+ )
Otras preguntas
Which substance has a chemical formula with the same ratio of metal ions to nonmetal ions as in potassium sulfide? (1) sodium oxide (2) sodium chloride (3) magn
Which statement BEST describes the goals of Latin American revolutionary leader Simon Bolivar in the 19th century? a. Bolivar needed aid from the United States
Which of the following statements about biogeochemical cycles is true? a. Biogeochemical cycles are cycles involving only nonliving components. b. The rock cy
Which statement best explains why most atomic masses on the Periodic Table are decimal numbers? (1) Atomic masses are determined relative to an H–1 standard. (2
According to the wave-mechanical model of the atom, electrons in an atom (1) travel in defined circles (2) are most likely found in an excited state (3) have a
In which one of the following examples is the date written correctly? A. Monday, November 12, 2014 B. Wednesday, Aug. 6 2013 C. Wed., 10-23, 1997
The best source of internal motivation is from A. relaxation. B. positive self-talk. C. a good job. D. coworkers' approval.
The relatively high boiling point of water is due to water having (1) hydrogen bonding (2) metallic bonding (3) nonpolar covalent bonding (4) strong ionic bondi
The bonds between hydrogen and oxygen in a water molecule are classified as(1) polar covalent (2) nonpolar covalent (3) ionic (4) metallic
Of the following, which imports the most oil in barrels per day? A. Taiwan B. Russia C. Saudi Arabia D. the United States
