5x^2+3x-128=0

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Solution for 5x^2+3x-128=0 equation:



5x^2+3x-128=0
a = 5; b = 3; c = -128;
Δ = b2-4ac
Δ = 32-4·5·(-128)
Δ = 2569
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-\sqrt{2569}}{2*5}=\frac{-3-\sqrt{2569}}{10} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{2569}}{2*5}=\frac{-3+\sqrt{2569}}{10} $

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