Answer/Discussion
to 1a
The thought behind this is that we are looking for the square root of 
.
This means that we are looking for an expression that, when we square it,
we get .
What do you think it is?
Let's find out if you are right:
Since 
squared is ,is
the square root of
Answer/Discussion
to 1b
The thought behind this is that we are looking for the cube root of 
.
This means that we are looking for an expression that, when we cube it,
we get .
What do you think it is?
Let's find out if you are right:
Since 
cubed is , is
the cube root of .
Answer/Discussion
to 1c
The thought behind this is that we are looking for the fourth root of 
.
This means that we are looking for an expression that, when we raise it
to the fourth power, we get .
What do you think it is?
Let's find out if you are right:
Since 
raised to the fourth power is and there is a negative in front of the radical, 
is
the negative fourth root of .
Answer/Discussion
to 1d
The thought behind this is that we are looking for the fifth root of 
. This means that we are looking for an expression that, when we
raise it to the fifth power, we get .
What do you think it is?
Let's find out if you are right:
Since 
raised
to the fifth power is , is
the fifth root of .
Answer/Discussion
to 2a
Since it didn't say that x or y are
positive, we have to assume that they can be either positive or negative.
Since the root number and exponent are equal, then we can use the 
rule.
Since the root number and the exponent inside are equal and are the
even number 2, then we need to put an absolute value around x
- y for our answer. The reason for the absolute value is that we do not
know if x or y are positive or negative. So if we put x - y as
our answer and it was negative, it would not be a true statement.
Answer/Discussion
to 2b
Since the root number and exponent are equal then we can use the rule.
This time our root number and exponent were both the odd number 3.
When an odd numbered root and exponent match, then the answer is the base
whether it is negative or positive.
Last revised on July 19, 2011 by Kim Seward.
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