PCAT Math QUICK QUESTION!

[217933]

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Okay so if your trying to narrow down the square root of 864, how do you end up with 6 squartroot of 6? Like what are the steps to getting that number?

 

[medicalCPA]

Okay so if your trying to narrow down the square root of 864, how do you end up with 6 squartroot of 6? Like what are the steps to getting that number?

You should not end up with 6*SQRT6, because the square of that number is 216.

If it were on the PCAT, I would eyeball it. It's >625, and <900, so you know that the correct answer would be between 25 and 30, probably closer to 30 than 25. Then I would select the answers that fit this criterion and square them to find the correct answer.

 

[2012PharmDmiss]

Okay so if your trying to narrow down the square root of 864, how do you end up with 6 squartroot of 6? Like what are the steps to getting that number?

My tip for doing math is..round everything! the answer will be obvious since it falls within the range. if you want the square root of 865 or whatever its the square root of 900. so it will be under 30. There will be an answer in the problem that will be obvious since it's close to 30. Same thing with the chemistry part. Since all problems are equal, do the easy ones first, don't get tided down by the hard problems.Good luck!

 

[161927]

How do you find the period of a trig function?

example: y = -7 + 3cos(pi * x)

Q: what is the period?

A: 2
...but why?

 

[Transformer]

How do you find the period of a trig function?

example: y = -7 + 3cos(pi * x)

Q: what is the period?

A: 2
...but why?

This is how you solve it:

set pi*x = 2*pi

and solve for x

x = 2*pi / pi = 2

hence, period = 2

good luck🙂

 

[SexyPlexi]

This is how you solve it:

set pi*x = 2*pi

and solve for x

x = 2*pi / pi = 2

hence, period = 2

good luck🙂

OMG this looks like a foreign language to me!! 😱 I took calc last fall but seriously...I have no idea what period is...or what you just did!! OMG Saturday is going to blow!!

LOL maybe since quant is the last section I just won't care that much by then...talk about endurance testing....

 

[2012PharmDmiss]

OMG this looks like a foreign language to me!! 😱 I took calc last fall but seriously...I have no idea what period is...or what you just did!! OMG Saturday is going to blow!!

LOL maybe since quant is the last section I just won't care that much by then...talk about endurance testing....

This is what I call a question you can skip instead of panicking...just don't skip more than 5...Good luck!

 

[clee18]

Okay so if your trying to narrow down the square root of 864, how do you end up with 6 squartroot of 6? Like what are the steps to getting that number?

sqrt of 864
= sqrt of 2*432
= sqrt of 2*2*216

when you have 2 of the same numbers under the root i.e. 2 in this case, you can move it to the outside of the root

so you get:
2 sqrt of 216

then do same for 216
= 2 sqrt of 2*108
= 2 sqrt of 2*2*54

so you get:

2*2 sqrt of 54


= 4 sqrt of 2*27
= 4 sqrt of 2*3*9
= 4 sqrt of 2*3*3*3

so you take out the 3 and move it to the outside:

= 4*3 sqrt of 2*3

and the final answer is 12 sqrt 6

 

[fallingsky]

would someone please help me with this problem? I'm confused!

If f(x) = 3^x and f(a) = 5, then what is f(2a) ?

I don't see any correlation between x and a. 😕

 

[Transformer]

would someone please help me with this problem? I'm confused!

If f(x) = 3^x and f(a) = 5, then what is f(2a) ?

I don't see any correlation between x and a. 😕

This is a log problem.

f(a) = 3^a = 5

f(2a) = 3^2a = Y

we are solving for Y

Note:

a = log 5 base 3

2a = log Y base 3

2(log 5 base 3) = log Y base 3

same as

log 5 ^ 2 base 3 = log Y base 3

since both sides should equal, then Y = 5 ^ 2 = 5*5 = 25

If f(a) = 3^a = 5

then, f(2a) = 3^2a = 25

🙂