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DrPepperx3

Help with 2 questions? Medal(:

  • one year ago
  • one year ago

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  1. DrPepperx3
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    7. Evaluate 1/2a^–4b^2 for a = –2 and b = 4. a. 2 b. 1/2 c. 3 d. 4 8. Is the following statement always, never, or sometimes true? A number raised to a negative exponent is negative. a. always b. never c. sometimes

    • one year ago
  2. jim_thompson5910
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    # 7 First simplify \[\Large \frac{1}{2}a^{-4}b^{2}\] \[\Large \frac{1}{2}\frac{1}{a^{4}}b^{2}\] \[\Large \frac{b^2}{2a^{4}}\] Now plug in a = -2 and b = 4 \[\Large \frac{(4)^2}{2(-2)^{4}}\] I'll let you finish

    • one year ago
  3. DrPepperx3
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    1/2 ?

    • one year ago
  4. jim_thompson5910
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    correct

    • one year ago
  5. DrPepperx3
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    K(: and what abput #8 ? I thought it was sometimes

    • one year ago
  6. jim_thompson5910
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    for #8, think about the following examples 2^(-3) (-4)^(-2) (-5)^(-3) (7)^(-4) Evaluate each and tell me what you get

    • one year ago
  7. DrPepperx3
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    2^(-3) = 1/8 (-4)^(-2) = 1/16 (-5)^(-3) = - 1/125 (7)^(-4) = 1/2401 ?

    • one year ago
  8. jim_thompson5910
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    perfect on all 4, what do you notice about the signs of each result

    • one year ago
  9. DrPepperx3
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    Well 1 is negative so i was right the answer is sometimes because the rest is positive

    • one year ago
  10. jim_thompson5910
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    correct, So when we say "A number (positive or negative) raised to a negative exponent is negative" is not always true (because you got 3 positive results out of 4), but it's not completely false either (you got 1 negative result out of 4) so that's why it's sometimes true

    • one year ago
  11. DrPepperx3
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    Ohhh Ty !

    • one year ago
  12. jim_thompson5910
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    you're welcome

    • one year ago
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