Anonym
Anonym
01-04-2015
Mathematics
Answered
completing the square
x^2 -2x -43=5
Answer :
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
01-04-2015
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
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