Seudónimo
Seudónimo
01-04-2015
Mathematics
contestada
completing the square
x^2 -2x -43=5
Respuesta :
naǫ
naǫ
01-04-2015
[tex]x^2-2x-43=5 \\ x^2-2x+1-1-43=5 \\ (x-1)^2-44=5 \\ (x-1)^2=49 \\ \sqrt{(x-1)^2}=\sqrt{49} \\ |x-1|=7 \\ x-1=7 \ \lor \ x-1=-7 \\ x=8 \ \lor \ x=-6 \\ \boxed{x=-6 \hbox{ or } x=8}[/tex]
Answer Link
Panoyin
Panoyin
02-04-2015
x² - 2x - 43 = 5
- 5 - 5
x² - 2x - 48 = 0
x =
-(-2) +/- √((-2)² - 4(1)(-48))
2(1)
x =
2 +/- √(4 + 192)
2
x =
2 +/- √(196)
2
x =
2 +/- 14
2
x = 1 +/- 7
x = 1 + 7 ∨ x = 1 - 7
x = 8 ∨ x = -6
Answer Link
VER TODAS LAS RESPUESTAS ( 12+ )
Otras preguntas
when the Lenape hunted
What is a Vector and a scalar?
what is 89 divided by 6 in long divison
what is 89 divided by 6 in long divison
How do I solve this equation? If 3t-7=5t then 6t=a 21b-7c-21d-42
What does compris mean in French ???
What is hyperbole? Please help
what were some of the problems that led to the rise of dictators in germany ,italy ,and japan?
What is Germany in German?
Why did the settlers go to new mexico during manifest destiny?