Elenathehomeschooler
  • Elenathehomeschooler
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
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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Elenathehomeschooler
  • Elenathehomeschooler
@amistre64 can you help me ?
amistre64
  • amistre64
well, what is our definition of a discriminant?
Elenathehomeschooler
  • Elenathehomeschooler
|dw:1444082947179:dw| right

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amistre64
  • amistre64
almost ... no sqrt and the -b is not proper|dw:1444083016556:dw|
Elenathehomeschooler
  • Elenathehomeschooler
okay
Elenathehomeschooler
  • Elenathehomeschooler
so do i plug in the numbers from the equation now ?
amistre64
  • amistre64
now how do we define a,b and c from the equation?
Elenathehomeschooler
  • Elenathehomeschooler
|dw:1444083189850:dw| is that right?
amistre64
  • amistre64
a=2 b=5 c=-3 yep
Elenathehomeschooler
  • Elenathehomeschooler
so now i plug it into the discriminant?
amistre64
  • amistre64
sure, i mean they aint gonna plug themselves in ...
Elenathehomeschooler
  • Elenathehomeschooler
ok
Elenathehomeschooler
  • Elenathehomeschooler
so the answer is 49
amistre64
  • amistre64
|dw:1444083545510:dw|
amistre64
  • amistre64
25+24 = 49 yes
amistre64
  • amistre64
but what does this tell us about the solutions?
amistre64
  • amistre64
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.
Elenathehomeschooler
  • Elenathehomeschooler
so it would have 2 real values

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