Question 136276: Please help me solve this using the quadratic formula:
2x^2+x=21 Found 2 solutions by stanbon, checkley77:Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! solve this using the quadratic formula:
2x^2+x=21
2x^2+x-21 = 0
x = [-1 +- sqrt(1-4*2*-2)]/4
x = [-1 +- sqrt(17)]/4
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Cheers,
Stan H.
You can put this solution on YOUR website! 2x^2+x=21
2x^2+x-21=0
x=(-1+-sqrt(1^2-4*2*-21])/2*2
x=(-1+-sqrt[1+168])/4
x=(-1+-sqrt169)/4
x=(-1+-13)/4
x=(-1+13/4
x=12/4
x=3 answer.
x=(-1-13)/4
x=(-14)/4
x=-3.5 answer.
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