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apple2357
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apple2357
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03-09-2018
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Today,
04:11 AM
apple2357
replied to a thread
Parametric to Cartesian
in
Intermediate/Advanced Algebra
Thanks!
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6 replies | 219 view(s)
Yesterday,
03:19 PM
apple2357
replied to a thread
80 degrees
in
Geometry and Trig
yes.
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10 replies | 241 view(s)
Yesterday,
10:48 AM
apple2357
started a thread
80 degrees
in
Geometry and Trig
Can anyone help me see why ACB is 80 degrees? I have tried playing with parallel lines and basic ideas of geometry and some similar triangles...
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10 replies | 241 view(s)
Yesterday,
10:15 AM
apple2357
replied to a thread
Parametric to Cartesian
in
Intermediate/Advanced Algebra
While we are on the subject of parametrics and cartesians.. I am wondering why we bother with a parametric form given cartesians do such a good...
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6 replies | 219 view(s)
01-17-2019,
01:49 PM
apple2357
replied to a thread
Parametric to Cartesian
in
Intermediate/Advanced Algebra
Thanks both, thats clear!
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6 replies | 219 view(s)
01-17-2019,
12:23 PM
apple2357
started a thread
Parametric to Cartesian
in
Intermediate/Advanced Algebra
I am trying to convert this parametric equation to cartesian: x= t2/4 , y= t3/16 By rearranging the first for t and substituting , i get y =...
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6 replies | 219 view(s)
01-11-2019,
02:36 PM
apple2357
replied to a thread
Range of y=x+1/x
in
Intermediate/Advanced Algebra
Ah yes, I'd forgotten that. But finding the inverse is not easy, x+1/x= y , x^2+1= yx x^2-yx +1=0 , (x-y/2)^2= y^2/4 -1 so inverse is y/2+-sqrt...
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5 replies | 415 view(s)
01-11-2019,
05:51 AM
apple2357
started a thread
Range of y=x+1/x
in
Intermediate/Advanced Algebra
I am trying to work out the range of f(x) = x + 1/x, after sketching it, i notice i can use calculus to find the turning points and establish it...
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5 replies | 415 view(s)
01-04-2019,
02:59 PM
apple2357
replied to a thread
Happy new year 2019 digit problem
in
Beginning Algebra
Someone sent it to me. And i couldn't see an interesting way to approach it so wondered if i was missing something!
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35 replies | 1486 view(s)
01-04-2019,
12:02 PM
apple2357
replied to a thread
Happy new year 2019 digit problem
in
Beginning Algebra
The one i got was 3027! But it was mostly guess work!
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35 replies | 1486 view(s)
01-03-2019,
05:33 PM
apple2357
started a thread
Happy new year 2019 digit problem
in
Beginning Algebra
The number 2019, its double 4038, and its triple 6057 contain all 10 digits. I am interested in the next number with this property? I have found one...
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35 replies | 1486 view(s)
01-03-2019,
02:47 PM
apple2357
replied to a thread
Isolating particular 3 digit numbers in excel
in
Intermediate/Advanced Algebra
Wow. That was quick. Let me try that! Edit: 2 mins later Just tried it! It does work. Thank you. Can you offer me any thoughts on what the...
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3 replies | 162 view(s)
01-03-2019,
02:19 PM
apple2357
started a thread
Isolating particular 3 digit numbers in excel
in
Intermediate/Advanced Algebra
I am trying to solve a problem that i want to check on excel. The problem is trying to find the sum of all 3 digit numbers that do not contain a...
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3 replies | 162 view(s)
12-31-2018,
04:21 PM
apple2357
replied to a thread
Definition of a function: Why do we not define functions as one-to-many?
in
Intermediate/Advanced Algebra
Good explanation. Thank you
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13 replies | 818 view(s)
12-31-2018,
02:35 PM
apple2357
replied to a thread
Definition of a function: Why do we not define functions as one-to-many?
in
Intermediate/Advanced Algebra
Edit...a little later I have just seen this with one of the links you provided earlier. Is this what you meant? ( though it is not easy to...
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13 replies | 818 view(s)
12-31-2018,
02:24 PM
apple2357
replied to a thread
Definition of a function: Why do we not define functions as one-to-many?
in
Intermediate/Advanced Algebra
Really interesting read. Thank you. There is a link that goes back nearly 20 years! How time flies! Can you clarify what you meant by this: ...
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13 replies | 818 view(s)
12-31-2018,
10:53 AM
apple2357
replied to a thread
Definition of a function: Why do we not define functions as one-to-many?
in
Intermediate/Advanced Algebra
I have been reading this book MATHEMATICS and the IMAGINATION Edward Kasner and James Newman And in it they say this: For instance, the...
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13 replies | 818 view(s)
12-31-2018,
10:49 AM
apple2357
replied to a thread
Definition of a function: Why do we not define functions as one-to-many?
in
Intermediate/Advanced Algebra
Thanks. I missed the link . so will read up about it!
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13 replies | 818 view(s)
12-31-2018,
04:27 AM
apple2357
replied to a thread
Definition of a function: Why do we not define functions as one-to-many?
in
Intermediate/Advanced Algebra
Thanks for your thoughts! No i haven't studied complex variables and didn't realise that there was a difference between arcsin and capital a...
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13 replies | 818 view(s)
12-30-2018,
02:38 PM
apple2357
started a thread
Definition of a function: Why do we not define functions as one-to-many?
in
Intermediate/Advanced Algebra
I understand functions can only be one-to-one or many-to-one ( like f(x) = x^2), is there a reason why we choose to not define functions as...
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13 replies | 818 view(s)
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