Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
read more ..

Melody Apr 2, 2022

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Reporting problems.

There are a number of people having problems at the moment.
If you lodge an error can you please give all relevant information that you can think of.
Where you are in the world - the city or the country - is often very important information. read more ..

Melody Mar 16, 2022

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How to make an empty rectangle in Latex

I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside read more ..

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Melody Mar 15, 2022

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HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

off-topic

Melody Mar 13, 2022

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WELCOME BACK CPHILL !

Melody Feb 11, 2022

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Very interesting question. No high level maths required.

This question was posted a couple of days ago.
https://web2.0calc.com/questions/geometry_73561

I think it is really interesting. It looks much more difficult than it really needs to be. read more ..

Melody Feb 1, 2022

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Members have a better experience. Their questions get more attention.

Almost everyone is posting as a guest.
If you post as a member your questions will have a far greater chance of a timely and helpful response.
If you are a genuine learner and interact with us, you will become known and answerers will do read more ..

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Melody Jan 9, 2022

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HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 2021

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Some guidelines for question askers.

Please note:
1) Ask only one question per post.
2) When asking a question talk about what you have tried for yourself. Then people will take you more seriously and will be more able and willing to help.
3) If you get an answer read more ..

off-topic

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Melody Nov 4, 2021

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Remeniscing - a little historical humour.

I just found this old post that some of you, who have been around for a while, might find amusing.

https://web2.0calc.com/questions/look-at-the-new-leader-board

off-topic

Melody Oct 29, 2021

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9x^2-16x-8
I assume you want this factorised.
To do this you need to find 2 numbers that add to -16 and multiply to (9*-8)
no such numbers exist

So it cannot be factorised with rational numbers.

MelodyOct 20, 2013

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There is no solution to this problem

If you want to prove this, let the two numbers be x and y.

x + y = 3 so y=3-x
and
x*y=40
so
x(3-x)=40

Expand the left side, then take it all to one side and put = 0
When you use the quadratic formula to solve you will find that there are no solutions.

MelodyOct 20, 2013

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hi Is 1 1/4% greater than 0.125

1 1/4 = 1.25

1.25% = 1.25 / 100 = 0.0125

Do you know which is bigger? 0.125 or 0.0125 ?

MelodyOct 20, 2013

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Calculus is a clever way to deal with instantaneous rates of change. It doesn't matter what the rate is measuring the techniques are really the same.
I would expect you to gain a similar degree of understanding.

MelodyOct 20, 2013

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Khadar's answer is good but I suspect that you need a surd answer.

4root3 * 6root6
=4*6*root3*root6
=24root18
=24root(9*2)
=24*root9*root2
=24*3*root2
=72root2 inches square

MelodyOct 19, 2013

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Which bit is 3^x-3 ?

Do you still need help or is it all sorted now?

MelodyOct 19, 2013

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I am suspicious that the question was not copied correctly but here is the answer for this question.

3 ^x+ 2 + 9 ^x + 1 = 810

3 ^x+ (3 ²) ^x +3 = 810

3 ^x + (3 ^x ) ²+ 3 = 810

(3 ^x) ² + (3 ^x) -807 = 0

let y=3 ^x

y ² + y -807 = 0

Using the quadratic formuls you end up with

y = [-1 +- sqr(3229)] / 2

y-2 = [-5 +- sqr(3229)] / 2
so
3 ^x - 2 = [-5 +- sqr(3229)] / 2

MelodyOct 18, 2013

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there is no number other than 1 that goes into both 39 and 68
Therefore it is already fully simplified.

MelodyOct 18, 2013

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MelodyOct 18, 2013

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MelodyOct 18, 2013