Therefore this isnt equivalent to the original

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Unformatted text preview: graph. [Return to Problems] (b) Now with this one let’s first address the minus sign under the square root in more general terms. We know that we can’t take the square roots of negative numbers, however the presence of that minus sign doesn’t necessarily cause problems. We won’t be able to plug positive values of x into the function since that would give square roots of negative numbers. However, if x were © 2007 Paul Dawkins 231 College Algebra negative, then the negative of a negative number is positive and that is okay. For instance, h ( -4 ) = - ( -4 ) = 4 = 2 So, don’t get all worried about that minus sign. Now, let’s address the reflection here. Since the minus sign is under the square root as opposed to in front of it we are doing a reflection about the y-axis. This means that we’ll need to change all the signs of points on x. Note as well that this syncs up with our discussion on this minus sign at the start of this part. Here is the graph for this function. [Return to Problems] © 2007 Paul Dawkins 232
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This note was uploaded on 06/06/2012 for the course ICT 4 taught by Professor Mrvinh during the Spring '12 term at Hanoi University of Technology.

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