logo for solving-math-problems.com
leftimage for solving-math-problems.com

Radical Properties











































Is the square root of (4-x2) the same as the square root of 4 minuse the square root of x2?

Comments for Radical Properties

Click here to add your own comments

Sep 16, 2011
Radical Properties
by: Staff


The question:

Is the square root of (4 - x²) the same as the square root of 4 minus the square root of x²?


The answer:

No, they are not the same.

Remember that the square root of a number times the square root of the same number must equal the original number.

√(4) * √(4) = 2 * 2 = 4

√(x) * √(x) = √(x * x) = √(x²) = x


Without more information the square root of (4 - x²) cannot be calculated.

It can, however, be factored:

4 - x² = (2 - x)*(2 + x)



Thanks for writing.

Staff
www.solving-math-problems.com


Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Math Questions & Comments - 01.



Copyright © 2008-2015. All rights reserved. Solving-Math-Problems.com