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I really need help! (Math)

posted by on .

Simplify the expression. Write your answer using only positive exponents.
Explain as well.

1. (8x)^3*8^-4
2. 2x^-5*y^-3
3. (4x^4y^-3)^-2
4. 1/(3x)^-2

  • I really need help! (Math) - ,

    1.
    8^3 x^3/8^4
    = x^3/8

    2. 2/x^5 * 1/y^3
    = 2/(x^5 y^3)

    3. 1/(4x^4 y^-3)^2
    = 1/(16x^8 y^-6)
    = y^6 /(16x^8)

    4. 1/(3x)^-2
    = (3x)^2
    = 9x^2

  • I really need help! (Math) - ,

    I don't understand how you got that for #1.

  • I really need help! (Math) - ,

    1. Notation confusion maybe
    (8^3 x^3) / 8^4
    = (1/8) x^3

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