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Math Help - possibly wrong answer in the book concerning exponent simplfying?

  1. #1
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    possibly wrong answer in the book concerning exponent simplfying?

    -2x^-3 * 5x^4 / 20x^-6

    in the book the answer is -1/2x^5

    but i got -1/2x^7 and so did my algebra program, the confusion is when your bring the -6 up, in the book it subtracts, can anyone shed some light?
    thx

    btw the -3 and -6 are neg. exponents, the program didnt bring em up for some reason sorry iam new
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  2. #2
    Super Member Quacky's Avatar
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    Quote Originally Posted by math69 View Post
    -2x^-3 * 5x^4 / 20x^-6

    in the book the answer is -1/2x^5

    but i got -1/2x^7 and so did my algebra program, the confusion is when your bring the -6 up, in the book it subtracts, can anyone shed some light?
    thx

    btw the -3 and -6 are neg. exponents, the program didnt bring em up for some reason sorry iam new
    I agree with your answer. It seems to be a straightforward application of (x^a)(x^b)=x^{a+b}
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  3. #3
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    yea and its an example problem too, confusing
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