SOLUTION: Please help solve this quadratic equation using the quadratic formula. {{{ 0.4x^2 + x - 0.3 = 0 }}}

Algebra ->  Finance -> SOLUTION: Please help solve this quadratic equation using the quadratic formula. {{{ 0.4x^2 + x - 0.3 = 0 }}}       Log On


   

Question 1031988: Please help solve this quadratic equation using the quadratic formula.
+0.4x%5E2+%2B+x+-+0.3+=+0+

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Please help solve this quadratic equation using the quadratic formula.
0.4x^2 + x - 0.3 = 0
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Multiply thru by 10 to get:
4x^2 + 10x - 3 = 0
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x = [-10 +- sqrt(100-4*4*-3)]/8
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x = [-10+ sqrt(4*37)]/8 = 0.2707
x = [-10-2sqrt(37)]/8 = -2.7707
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Cheers,
Stan H.
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