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PSAT Math Videos 28 videos
PSAT 1.1 Math Diagnostic. If a rabbit consumes 3 meals a day, how many grams of food will a rabbit consume in 7 days?
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PSAT 1.10 Math Diagnostic. Which of the following is a factor of the expression?
PSAT 1.7 Math Diagnostic 212 Views
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PSAT 1.7 Math Diagnostic. What is the value of x?
More Video DetailsTranscript
- 00:00
Thank you We sneak and here's your shmoop du jour
- 00:05
brought to you by hot dogs We hope you'll relish
- 00:08
this one If four square root of ax equals eight
- 00:14
Acts minus 24 what's the value of acts and hear
- 00:17
potential answers all right little fashion algebra but what a
Full Transcript
- 00:21
mess It looks simple enough but once we realize that
- 00:24
there's a square root on one side not the other
- 00:27
and that multiplying or adding anything that both sides only
- 00:30
makes it look more daunting it's almost enough to make
- 00:32
us throw our hands up in the air give up
- 00:35
on this problem and distract ourselves instead with a hot
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dog or two But then inspiration strikes You don't even
- 00:41
have to worry about simplifying this equation in a test
- 00:44
situation where every seconds precious why not go easy on
- 00:47
ourselves and take a shortcut here All we have to
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do is plug in the four answer choices one by
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one until we find the one that makes the equation
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true It's quick it's easy and shortcuts go there's Very
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little chance of us getting it wrong So we'll start
- 01:00
with a a and see if that works well Two
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point two five Lugging that into the equation We get
- 01:05
four times square to two point two five equals eight
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times two Point two five minutes twenty four we'll square
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in a two point two five one point five times
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for and that six on the right side of the
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equation eight times two point two fives eighteen minutes twenty
- 01:21
for well that's negative six we don't see any absolute
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value signs around that sucker so we could get rid
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of a what about c five else plugging in this
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time We've got four times square root of five which
- 01:33
can be simplified more than four square route five equals
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eight times five or forty minus twenty four which is
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sixteen One side still has square root symbol on the
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other dozen Well in this scenario the equal signs a
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big fat liar and ain't see let's try d eight
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unfortunately that same problem here eight is the same as
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four times too so we can rewrite it as two
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square root of two But even still no matter how
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you cut it we're gonna end up with a square
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root symbol on the left side of the equation and
- 02:02
there won't be one on the right so will bid
- 02:04
and not so fond farewell to d well the right
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answer is b for the square root of four is
- 02:09
exactly to which gets rid of that ugly symbol Two
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times Four is eight equals eight tons for or thirty
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two minus twenty four which is also ate and there's
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our true statement Speaking of true statements if he ever
- 02:20
tried ordering a hot dog with ketchup in the city
- 02:22
of chicago you will immediately be arrested You don't believe 00:02:25.865 --> [endTime] us Just try it We double hot dog area
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