anonymous
  • anonymous
Rewrite each expression with positive exponents and simplify. ( –3x^2)^3 *(9x^3)^–1 . i got 243x^3 but its wrong :(
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Well done for trying. Can you show me your working, either in text, or using Draw, or by scanning/taking a photo and using Attach File?
anonymous
  • anonymous
sure
anonymous
  • anonymous
Great

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More answers

anonymous
  • anonymous
(-3x^2)^3=-27x^6. (9x^3)^-1=-9x^-3 then i multiplied the two and got 243x^3
anonymous
  • anonymous
Ok, what should the answer be?
anonymous
  • anonymous
243x^3
anonymous
  • anonymous
oh nvm. what SHOULD it be, lol.
anonymous
  • anonymous
yep :D
anonymous
  • anonymous
well im thinking i need to get a negative exponent. so that i'll have to put the x in the denominator of a fraction
anonymous
  • anonymous
|dw:1327952013711:dw| Is this what the question is, before we go any further?
anonymous
  • anonymous
yep
anonymous
  • anonymous
Alright, then you got the first bit right, but not the second bit. As you said, negative exponents mean it becomes a denominator.
anonymous
  • anonymous
Do you know this rule?|dw:1327952197252:dw|
anonymous
  • anonymous
yes i do.
anonymous
  • anonymous
so the second part is supposed to be like, -9/x^3
anonymous
  • anonymous
Great, so the second bit becomes |dw:1327952244545:dw|
anonymous
  • anonymous
No, that's where you went wrong
anonymous
  • anonymous
The brackets around the (9x^3) means that all of it goes in the denominator, not just the x^3
anonymous
  • anonymous
In any case, 9^-1 is 1/9, not -9
anonymous
  • anonymous
ok, i just miswrote an example my teacher gave me so that threw me off. i was going by that.
anonymous
  • anonymous
No worries, easy mistake to make :D
anonymous
  • anonymous
What do you make of the final answer then?
anonymous
  • anonymous
i got -3x^3
anonymous
  • anonymous
That seems right to me. Have you got the answers page to check with?
anonymous
  • anonymous
yep its right. thank you for explaining it!
anonymous
  • anonymous
You're most welcome! :)

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