okendall
okendall okendall
  • 22-01-2020
  • Mathematics
contestada

2. Confirm that 1 + V5 and 1 - V5 are the correct roots for x^2 - 2x - 4 = 0.

Respuesta :

Kuroi
Kuroi Kuroi
  • 22-01-2020

Answer:

Step-by-step explanation:

[tex]{\displaystyle \Delta =b^{2}-4ac} (for this equation b=-2 ; a=1 ; c=-4 )

Δ= (-2)^2-4*(-4)*1=4+16=20

\sqrt{20} =2\sqrt{5}

x_{1}=\frac{2+2\sqrt{5} }{2} = \frac{2(1+\sqrt{5)} }{2} =1+\sqrt{5

x_{2}=\frac{2-2\sqrt{5} }{2} = \frac{2(1-\sqrt{5)} }{2} =1-\sqrt{5 [/tex]

Answer Link

Otras preguntas

Which was an advantage for the South at the start of the Civil War? It had a smaller population than the North. It had cotton it could sell to Europe. It had a
All of the following are good suggestions for online learners EXCEPT: A. Set aside an area in your apartment or house specifically for doing work B. Ensure tha
Nonmetals are ___. O part of group 18 O are always gases O good conductors of heat O poor conductors of heat
If B is between A and C and AB = 3x + 1, BC = 2x - 7, and AC = 24, then find the value of x.
Do you think direct democracy would work in the United States?
the oil painting above entitled the dream uses visual metaphor. true or false
expand the proverb: Necessity is the mother of invention​
Who has the best chicken sandwich
The Anglo-Saxon word for poet or story teller is:
What is the solution to the equation 3x + 5(4x - 6) - 8 = 3x + 24?*