miababygirl1987
can someone please help me with this problem please
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miababygirl1987
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I am suposse to smplify it
|dw:1330211637642:dw|
gjakova
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|dw:1330211747318:dw|
gjakova
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|dw:1330211833532:dw|
miababygirl1987
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and (3xy^2) (-7x^2y^4) I am suppose to multipy this
and I have no cluse how to
AccessDenied
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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
miababygirl1987
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because I got 21x^3y^6 but I dont think it is right
cathyangs
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multiply the like parts: 3 goes with -7, x with x, and y with y.
cathyangs
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you missed the negative is all. :D
miababygirl1987
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how do I Write 625 in exponential notation
cathyangs
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you mean in scientific notation?
cathyangs
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or in prime factorization?
miababygirl1987
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no it says expontial notation
AccessDenied
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Exponential notation is scientific notation, I believe.
a * 10^b, where 1 <= a <= 9, and a,b are integers
cathyangs
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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.
AccessDenied
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oops, I should say, a is not integer! I forgot! D:
cathyangs
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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.
cathyangs
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well, a can be an integer, but doesn't have to.
miababygirl1987
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how do you work this kind of problem ?
|dw:1330212185975:dw|
cathyangs
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(a/b)^x = (a^x)/(b^x). You can apply this to that equation.
miababygirl1987
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because I got 9/16 is that right ?
cathyangs
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try again.
miababygirl1987
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I got this time 6/16
cathyangs
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...?
Make sure you do the inner parentheses first.
miababygirl1987
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now I got 1/2
cathyangs
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that's right. gj!