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TSI Math: Using Every Trick in the Box to Simplify an Expression 0 Views
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Description:
Simplify the following expression.
- Test Prep / TSI
- TSI / TSI Math
- TSI / TSI Mathematics
- Intermediate Algebra and Functions / Rational and Exponential Expressions, Equations, and Functions
- Intermediate Algebra and Functions / Rational and Exponential Expressions, Equations, and Functions
- TSI Mathematics / Intermediate Algebra and Functions
- Test Prep / TSI
- TSI Math / Intermediate Algebra and Functions
Transcript
- 00:02
Okay sy mass Shmoop er's simplify the following expression Okay
- 00:09
uh this one's really ugly Oh my goodness So we
- 00:13
considered replacing our regularly scheduled programme solving programming with reruns
- 00:18
from our youtube channel but it turns out that while
- 00:20
people are more interested in how to simplify algebraic expressions
Full Transcript
- 00:23
than they are in watching us create scale models of
- 00:26
famous landmarks using pasta weird we're so good at that
- 00:29
All right so asking you shall receive while there are
- 00:31
many ways to begin simplifying this gnarly crazy exponential expression
- 00:36
but well here we're going to eliminate negative exponents first
- 00:39
to make the exponents positive move the variable to the
- 00:43
opposite location in the fraction variables in the numerator go
- 00:47
to the denominator and variables in the denominator go to
- 00:50
the numerator see how we do this here So we've
- 00:52
got well that we're starting with the twenty are the
- 00:55
negative too and then ethan and stuff and then we're
- 00:58
going to do is just move everything here flip flop
- 01:01
so we've got this ugly beast right here so we
- 01:04
simplified by multiplying variable terms with the same bases together
- 01:07
When this happens the exponents are added so that gets
- 01:11
us What is that twenty r cubed And here And
- 01:14
then in six r squared plus once we add the
- 01:16
two in the one there when we have in our
- 01:17
times and our down here we've gotten as to the
- 01:20
first honest to the force it's nice They put the
- 01:23
s to the first there on the exam They may
- 01:24
not be so kind so that gets us as to
- 01:27
the fifth here on the bottom And then we got
- 01:29
as to the third And as to the second there's
- 01:31
what's going on adam And that consists s to the
- 01:33
fifth All right so this is way simpler here Twenty
- 01:35
r cubed over ten r squared as to the fifth
- 01:38
plus six r cubed over eight s to the fifth
- 01:40
So next up when dividing factors with like bases like
- 01:44
you know the r's and the first fraction there subtract
- 01:47
the exponents so we can actually do that that's legal
- 01:49
even in even in texas So we've got twenty are
- 01:52
cube there and we're just going to subtract the two
- 01:55
from down here to get rid of it So what
- 01:58
does that make it All right so then we've got
- 01:59
twenty art of the first Well over ten as to
- 02:02
the fifth and then six r q P o radius
- 02:04
Okay well so what else can we do here tio
- 02:08
Simplify things Well finally we can simply the coefficients of
- 02:12
each fraction is if they didn't have dedicated variable followers
- 02:15
Right So let's think about this Just cross out the
- 02:18
zeros there Twenty over ten becomes too over one And
- 02:21
just two And the six over eight There becomes three
- 02:23
force So we got two r over us to the
- 02:26
fifth plus three r cubed over for s to the
- 02:29
fifth Okay so that's about as simple as we can
- 02:32
get but we're not done The simplified expression is not
- 02:35
the same as this Eight are over us and so
- 02:39
on Equation on d there which is one big hint
- 02:42
The fractions should be added Multiply the first fraction by
- 02:45
four over four to create a common denominator of four
- 02:49
ass to the fifth See how clever that is So
- 02:51
we can go for over four times as so we
- 02:53
get eight And then plus the three are there over
- 02:57
four Asked to the fifty weaken adam that's that's Kind
- 03:00
of a luxury around here So what does that Give
- 03:02
us well added new rangers Crossed top and simplest expression
- 03:04
is b eight are plus three r cubed over for
- 03:07
ass to the fifth Okay we're done We're shmoop
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