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TSI Math: Adding and Simplifying Fractions 4 Views
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Description:
What is the sum of
and
?
- 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
- 00:01
Okay sy match members Here we go What is this
- 00:04
Some of twenty seven over x squared minus eighty one
- 00:06
and three Acts over x squared minus 80 one Yeah
- 00:14
So today's our lucky day these two fractions already have
- 00:17
the same denominator right there Go right ahead and add
Full Transcript
- 00:19
the numerator is right So we got twenty seven plus
- 00:22
three x Now we need to think about what we
- 00:24
can cancel Well we'll have to factor the numerator and
- 00:27
the denominator factor A three out of the numerator they're
- 00:30
on We've got three times quantity nine plus x and
- 00:34
then x squared minus eighty one Well that's x plus
- 00:37
nine and x minus nine It looks just like that
- 00:40
right You were tipped off that x squared and then
- 00:43
nothing x and then a number there That's perfect square
- 00:46
usually is a big hint on these kind of problems
- 00:48
so recognize it All right well then we have nine
- 00:50
plus acts is uh well x plus nine So cancel
- 00:54
this factor from both sides of the fraction and we're
- 00:56
left with three over x minus nine So the answer
- 01:00
is b and that's it for ah goodbye to this 00:01:03.448 --> [endTime] section
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