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s66821

can someone show me the steps solving this inequality? 2a^3+2>0

  • 2 years ago
  • 2 years ago

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  1. dinainjune
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    2a^3>-2 a^3>-1

    • 2 years ago
  2. dinainjune
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    a>-1

    • 2 years ago
  3. s66821
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    but answer on the solution book is a<-1..... and i don't know y...

    • 2 years ago
  4. dinainjune
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    oh, hmm i actually forget too about this square root. i'll try to ask that

    • 2 years ago
  5. s66821
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    thx;]

    • 2 years ago
  6. Akshay_Budhkar
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    a^3>-1 is implying a<-1 and not greater than.. you can verify it by putting the values of positive integers..

    • 2 years ago
  7. dinainjune
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    akshay can you help me to explain what is values of positive integers?

    • 2 years ago
  8. s66821
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    may be there's sth wrong on the solution bk,,,i'll ask my teacher tmr,,,,,thx...

    • 2 years ago
  9. dinainjune
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    okay, your welcome :) anyway, you can see the answer in my question too

    • 2 years ago
  10. s66821
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    ya ,i'll

    • 2 years ago
  11. Akshay_Budhkar
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    for positive integers it is the other wway round.. the sign doesn't change for positive cubes. you can verify it again :)

    • 2 years ago
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