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Additional Topics in Math Videos 10 videos

PSAT 1.20 Math Diagnostic
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PSAT 1.20 Math Diagnostic. Approximately what percentage of the electoral votes will she receive if she meets this goal?

PSAT 1.21 Math Diagnostic
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PSAT 1.21 Math Diagnostic. The map above shows the electoral votes for the western part of the United States. Which of the following statements is...

PSAT 1.12 Math Diagnostic
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PSAT 1.12 Math Diagnostic. Which of the following graphs best models the relationship between anemone toxicity x and the number of clownfish y?

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PSAT 1.31 Math Diagnostic 177 Views


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Description:

PSAT 1.31 Math Diagnostic. Which of the following must be equivalent to the equation?


Transcript

00:00

Thank you We sneak And here's your smoke too Sure

00:05

brought to you by equivalent expressions like how good morning

00:09

in america means the same thing as bugger off in

00:13

england We really need to take a trip back there

00:15

one day Everyone's So friendly All right which of the

00:17

following must be equivalent Tio this thing's equals a b

00:20

over tea and hear the potential answers there Okay so

00:24

we're looking for something that's equivalent to see equals a

00:27

b over d i see something that says exactly the

00:30

same thing but in a different way Variety is the

00:33

spice of life after all Or maybe that's oregano We're

00:36

always getting those two Okay first thing will probably want

00:39

to do is get that d out of the denominator

00:43

on the righthand side So as always we can multiply

00:45

both sides to get d somewhere more manageable Doing this

00:49

we get cd equals a b Well if cd equals

00:53

a b then option c will be true when d

00:55

equals one for example But most of the time there's

00:58

no way These two will be equivalent So we can

01:01

nick see option d looks sort of similar to what

01:03

we came up with But it's pulled the old switcheroo

01:06

with a and c so it's not d either option

01:09

a suggests that c equals d over a b but

01:11

isolate see we'd have to divide Both sides are new

01:14

equation by d and we'd wind up with exactly what

01:17

we started with a b over D is definitely not

01:20

the same thing as thie over a bee so we're

01:22

not going to be taken in by option a is

01:24

charms however if we divide both sides by sea we

01:28

get b equals a b oversee which is option b

01:32

though there's our equivalent expression And by the way any

01:34

of you know what it means When someone in ireland

01:37

says yeah we couldn't find it in our irish to 00:01:40.437 --> [endTime] english dictionary anyway so it's no fair

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