Cube root

[SirDigbyChickenCaesar]

Now I understand how some people have so many posts on this forum...

 

[milagros317]

It's not too hard to figure out. 😛

 

[chrisheaven]

Now I understand how some people have so many posts on this forum...

Well figured

 

[SirDigbyChickenCaesar]

I would have gotten it sooner, but I'm not good with polar form. 😀

 

[milagros317]

The one word thread is even quicker, you only have to post one stinking word. 😀

 

[chrisheaven]

yeah.but which word?

 

[milagros317]

I tend to post short words there, only three to six letters. 😀

 

[chrisheaven]

xxx
A three letter word-indicated by xxx
requires something else so that the message " the post is too short" does not appear

 

[milagros317]

I usually use a few dots, as in:

pig ...

😀

 

[chrisheaven]

... .

 

[milagros317]

To get back on topic, the cube root of .000027 is .03 😀

 

[chrisheaven]

and the cube root of 0 is.......?

 

[milagros317]

and the cube root of 0 is.......?

0, obviously. It is the unique complex number that has only one cube root. 😀

 

[chrisheaven]

can you have a cube root that is negative?

 

[milagros317]

Every negative real number has a real cube root that is also negative. 😀

 

[chrisheaven]

so the cube root of -27 is -3?

 

[milagros317]

Yes. For any positive real number, a, the cube root of -(a^3) is -a. 😀

 

[chrisheaven]

to solve cube roots using an abacus--
look here
http://webhome.idirect.com/~totton/soroban/Cube_Root/

 

[milagros317]

Remarkable, thanks for the link. 😀

 

[chrisheaven]

a pleasure

 

[milagros317]

My 8th grade teacher had us extract cube roots by hand (that is, with pencil and paper), just to show us that it could be done. 😀

 

[chrisheaven]

find the cube root of 50653

first divide the no: into groups of 3 from right to left

so we get the groups as 50 653

now for the 1st group 50 falls between 27 and 64 (2 cubed and 3
cubed) the tens figure of the cube root will be the root of the lower
no: that is 3.

now to find units digit,the cubic no: ends in 3 its cube root will
end in 7.

the cube root you are seeking is 37

 

[milagros317]

We learned to find them to as many decimal places as desired when the number is not a perfect cube. 😱

 

[chrisheaven]

indeed