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Elenathehomeschooler

  • one year ago

Can someone help me understand how to solve this problem! use the discriminant to determine the nature of the roots 2x^2+5x-3=0

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  1. Elenathehomeschooler
    • one year ago
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    @amistre64 can you help me ?

  2. amistre64
    • one year ago
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    well, what is our definition of a discriminant?

  3. Elenathehomeschooler
    • one year ago
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    |dw:1444082947179:dw| right

  4. amistre64
    • one year ago
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    almost ... no sqrt and the -b is not proper|dw:1444083016556:dw|

  5. Elenathehomeschooler
    • one year ago
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    okay

  6. Elenathehomeschooler
    • one year ago
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    so do i plug in the numbers from the equation now ?

  7. amistre64
    • one year ago
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    now how do we define a,b and c from the equation?

  8. Elenathehomeschooler
    • one year ago
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    |dw:1444083189850:dw| is that right?

  9. amistre64
    • one year ago
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    a=2 b=5 c=-3 yep

  10. Elenathehomeschooler
    • one year ago
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    so now i plug it into the discriminant?

  11. amistre64
    • one year ago
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    sure, i mean they aint gonna plug themselves in ...

  12. Elenathehomeschooler
    • one year ago
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    ok

  13. Elenathehomeschooler
    • one year ago
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    so the answer is 49

  14. amistre64
    • one year ago
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    |dw:1444083545510:dw|

  15. amistre64
    • one year ago
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    25+24 = 49 yes

  16. amistre64
    • one year ago
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    but what does this tell us about the solutions?

  17. amistre64
    • one year ago
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    youre welcome since the discrimininant is under a square root radical; it has 2 real values if it is bigger than 0; it has only 1 value if it is equal to 0; and it has only complex values if it is negative.

  18. Elenathehomeschooler
    • one year ago
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    so it would have 2 real values

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