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s66821

  • 4 years ago

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

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  1. dinainjune
    • 4 years ago
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    2a^3>-2 a^3>-1

  2. dinainjune
    • 4 years ago
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    a>-1

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

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

  5. s66821
    • 4 years ago
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    thx;]

  6. Akshay_Budhkar
    • 4 years ago
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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..

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

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

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

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

  11. Akshay_Budhkar
    • 4 years ago
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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 :)

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