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Which of the following expressions is equal to x⁵ × x²?
What is the simplified form of the expression ?
ACT Aspire Math: Taking Shortcuts with Exponent Properties 3 Views
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Description:
What is the value of (-2)⁶?
Transcript
- 00:01
Okay Shmoop math people Here we go Another drill for
- 00:04
you What is the value of the quantity Negative to
- 00:08
to the sixth power All right let's think about this
- 00:15
one The most straightforward way to perform this kind of
- 00:17
calculation would be to multiply negative too by itself Six
Full Transcript
- 00:20
times But well that's not terribly efficiently Not all the
- 00:24
time Instead we can use the properties of exponents to
- 00:26
take a shortcut Well the power rule for exponents tells
- 00:29
us that when one term with exponents is raised to
- 00:32
another exponents weaken simplify the expression by multiplying the two
- 00:35
exponents In other words x to the a power that
- 00:38
quantity to the b is the same as x to
- 00:41
the quantity eight times be so we can use this
- 00:44
route change the problem so that we can work with
- 00:46
a familiar cube root and square root Familiar like we
- 00:50
know two squared for without really been thinking about it
- 00:52
Right So what does that give us Let's factor out
- 00:54
something's here we got negative two to the six that
- 00:56
quantity which is the same as negative too toothy three
- 01:01
times two which is the same as a double quantity
- 01:04
thing here negative two cubed and then square so if
- 01:08
we do all that out that gets us negative eight
- 01:11
squared right because two four eight would be to cuba
- 01:14
And then we've got negative to cube being negative eight
- 01:17
and negative Eight square to sixty four so negative to
- 01:20
to the sixth power is positive sixty four and negative
- 01:24
sixty four's and b might be tempting but it's incorrect
- 01:26
because any imager raised two and even power must be
- 01:30
a positive number So anyway that's it It's sixteen And
- 01:33
yes you could have brute force this one just as
- 01:35
easily But we're doing this says that the on the
- 01:37
exam when they give you to the seventeenth power in
- 01:39
the thirty fourth power you can kind of do it 00:01:42.163 --> [endTime] quicker and easier Hopefully good luck with that
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