Register to reply 
Y=X^1/2 is the same as Y=+/sqrt(X) ? 
Share this thread: 
#1
Feb1212, 04:02 AM

P: 94

1. The problem statement, all variables and given/known data
This is from a textbook: Y=X^1/2 is the same as Y=+/sqrt(X) 2. Relevant equations 3. The attempt at a solution 100^1/2=10 How is 100^1/2=10 also true? Thanks. 


#2
Feb1212, 05:12 AM

Sci Advisor
HW Helper
Thanks
P: 26,148

hi solve!
(which book?) 


#3
Feb1212, 05:36 AM

P: 94

As for the book, I dont wanna name it and make the otherwise excellent textbook look bad. 


#4
Feb1212, 12:47 PM

Sci Advisor
HW Helper
Thanks
P: 5,186

Y=X^1/2 is the same as Y=+/sqrt(X) ?
RGV 


#5
Feb1212, 01:17 PM

Emeritus
Sci Advisor
HW Helper
PF Gold
P: 7,819

On the other hand, if the author is explaining how to solve y^{2} = x, for y, or solve y^{2} = 100 for y, then the answers are:
y = ± √(x) = ±(x)^{1/2} for y^{2} = xIf this is the case you have only told us part of what the textbook was claiming, although the author may have also left a few details out of her/his explanation. 


Register to reply 
Related Discussions  
Prove that the limit of sin(sqrt(x+1))sin(sqrt(x1)) at infinity doesn't exist  Calculus & Beyond Homework  10  
Prove series is divergent (sqrt(n+1)  sqrt(n))/sqrt(n)  Calculus & Beyond Homework  5  
Iterative square root? sqrt(2+sqrt(2+sqrt(...  General Math  6  
Is there a way to show that sqrt(2)+sqrt(3)+sqrt(5) is algebraic over Q?  General Math  4  
Proof that sqrt(6)sqrt(2)sqrt(3) is irrational  General Math  10 