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Posted by on Wednesday, May 27, 2009 at 2:59pm.

so i got a question and would like to know if i did this right

For problems 1 through 38, transform the given expression to simple radical form. You can check your answer by evaluating it and the original expression by calculator.

on the previous page this definition was given

Simple Radical Form
An expression is in simple radical form if

1. the radicand of an nth root contains no nth powers as factors,
2. the root index is as low as possilbe, and
3. there are no radicals in the denominator

and this is problem number 4

4. 108^(1/3) + 10(32)^(1/3)+ 500^(1/3)

and for my answer I got

about 31.4289(2)^(1/2)

my instructors instructions were to round to four decimals out from the decimal which I have done...

Is this answer correct?
If not what rule did I break?
If I did do this wrong how do I do it the right way?
I checked by calculator and got the right answer so I think I have the right answer and I don't think I broke any of the rules according to my textbook...

so I would just like to make sure...

also what is the point of having the division symbol when 3*1/4 can be written as 3 * 4^-1 which makes more sense to write out like to me because then all of the fraction rules actually work that I was taught back in like 4th grade but was not provided any proof...

  • Algebra 2 - , Wednesday, May 27, 2009 at 3:10pm

    108^(1/3) + 10(32)^(1/3)+ 500^(1/3)
    =(27*4)1/3 + 10*(4*8)1/3 + (125*4)1/3
    =(3+20+5)(4)1/3
    check my thinking.

  • TO BOBPURSLEY - , Wednesday, May 27, 2009 at 3:12pm

    makes sense to me but is my answer also correct?

  • Algebra 2 - , Wednesday, May 27, 2009 at 3:23pm

    I do not think that your answer was obtained without a calculator. To get SRform, you should have to do no calculations with roots. See my work. If I were your teacher, and you gave me that answer, I would mark it wrong, and let you prove you got it without a calculator.

  • TO BOBPURSLEY - , Wednesday, May 27, 2009 at 3:33pm

    huh interesting well thanks

    my only last question is what's is the point of us SRform?

    I undrestand that in some rare cases you might not have a calculator but in most cases you will... but anyways using SRform is to simplify when you don't have a calculator correct?

    If this is so what good does it do you if get (3+20+5)(4)1/3 as an answer because you wouldn't be albe to get an answer that you could do anything with correct??? Like if you were trying to find the length of something and had to cut a piece of wood or something you wouldn't know what (3+20+5)(4)1/3 is and wouldn't be able to do anything unless you could evaluate with a calculator correct???

    Also what do you recomend one to do if you have a very large number and have to use SRform such as 5.99 E 24 kg the mass of the earth correct? and have to use SR form of something like that???? What would you do without a calculator?

    also does it make more sense to write fractions out with inverse exponents instead because for some reason to me it makes a lot more sense????

  • Algebra 2 - , Thursday, November 12, 2009 at 6:01pm

    M+4
    M-6

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