- Thread starter
- #1
bergausstein
Active member
- Jul 30, 2013
- 191
can you tell the difference
$\displaystyle \sqrt{(1)^2}=1$
$\displaystyle \sqrt{(-1)^2}=-1$
$\displaystyle \sqrt{(1)^2}=1$
$\displaystyle \sqrt{(-1)^2}=-1$
The major difference is that the first one is right and the second one is wrong! Both [tex](1)^2[/tex] and [tex](-1)^2[/tex] are equal to 1 so both of those is [tex]\sqrt{1}[/tex]. And [tex]\sqrt{a}[/tex] is defined as the positive number, x, such that [tex]x^2= 1[/tex].can you tell the difference
$\displaystyle \sqrt{(1)^2}=1$
$\displaystyle \sqrt{(-1)^2}=-1$