JinxyV
JinxyV JinxyV
  • 03-01-2017
  • Mathematics
contestada

Using the discriminant, determine the number of real solutions.
-2x^2+x-28=0

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Аноним Аноним
  • 03-01-2017
I hope this cleared your doubt!
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lamochick
lamochick lamochick
  • 03-01-2017
Discriminant: b² - 4ac
Equation: y = -2x² + x - 28
a = -2
b = 1
c = -28
1² - (4*-2*28) = 225
-2x² + x - 28 = 225
-2x² + x -(28 -225) = 0   {In order to make it true}
-2x² + x +197 = 0           {Now factorise}
X = 10.177 
     or
X = -9.678

Please double check this. 
My first answer was "No real Roots"...But I did it again and got two figures. You'll have to confirm this with a pair. Sorry. 

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