Question 94023: NEED HELP PLEASE!!!!!!!
Need to find all roots usingthe rational root theorem - OMG
f(x)= 2x^2 + 5x -4
Thanks so much
llo
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! f(x)= 2x^2 + 5x -4
That Theorem says if P/q is a rational root of f(x) "q" is a divisor of -4 and
"p" is a divisor of 2.
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q candidates: +-1, +-2, +-4
p candidates: +-1, +-2
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I checked the quadratic formula.
There are no rational roots for this function.
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x = [-5+-sqrt(25-4*2*-4)]/4
x = [-5+-sqrt(57)]/4
None of these roots is rational.
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Cheers,
Stan H.
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