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miababygirl1987

  • 4 years ago

can someone please help me with this problem please

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  1. miababygirl1987
    • 4 years ago
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    I am suposse to smplify it |dw:1330211637642:dw|

  2. gjakova
    • 4 years ago
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    |dw:1330211747318:dw|

  3. gjakova
    • 4 years ago
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    |dw:1330211833532:dw|

  4. miababygirl1987
    • 4 years ago
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    and (3xy^2) (-7x^2y^4) I am suppose to multipy this and I have no cluse how to

  5. AccessDenied
    • 4 years ago
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    Property of Multiplying exponents of the same base: \[ a^{m} a^{n} = a^{m + n} \] -7 * 3 = -21 x * x^2 = x^(1+2) = x^3 y^2 * y^4 = y^(2+4) = y^6

  6. miababygirl1987
    • 4 years ago
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    because I got 21x^3y^6 but I dont think it is right

  7. cathyangs
    • 4 years ago
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    multiply the like parts: 3 goes with -7, x with x, and y with y.

  8. cathyangs
    • 4 years ago
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    you missed the negative is all. :D

  9. miababygirl1987
    • 4 years ago
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    how do I Write 625 in exponential notation

  10. cathyangs
    • 4 years ago
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    you mean in scientific notation?

  11. cathyangs
    • 4 years ago
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    or in prime factorization?

  12. miababygirl1987
    • 4 years ago
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    no it says expontial notation

  13. AccessDenied
    • 4 years ago
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    Exponential notation is scientific notation, I believe. a * 10^b, where 1 <= a <= 9, and a,b are integers

  14. cathyangs
    • 4 years ago
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    ...ok, I'm guessing that's the same as scientific. The first part has to be a number between 1 and 9, which in your case is 6.25. Because you have to multiply 6.25 by 100 to get 625, it's 6.25*100, or 6.25*10^2 in scientific notation.

  15. AccessDenied
    • 4 years ago
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    oops, I should say, a is not integer! I forgot! D:

  16. cathyangs
    • 4 years ago
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    alternately, you can think of it as: from 6.25 to 625, you have to move the decimal back 2 places, so it's 10^2.

  17. cathyangs
    • 4 years ago
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    well, a can be an integer, but doesn't have to.

  18. miababygirl1987
    • 4 years ago
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    how do you work this kind of problem ? |dw:1330212185975:dw|

  19. cathyangs
    • 4 years ago
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    (a/b)^x = (a^x)/(b^x). You can apply this to that equation.

  20. miababygirl1987
    • 4 years ago
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    because I got 9/16 is that right ?

  21. cathyangs
    • 4 years ago
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    try again.

  22. miababygirl1987
    • 4 years ago
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    I got this time 6/16

  23. cathyangs
    • 4 years ago
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    ...? Make sure you do the inner parentheses first.

  24. miababygirl1987
    • 4 years ago
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    now I got 1/2

  25. cathyangs
    • 4 years ago
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    that's right. gj!

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