9x2-15x-6=0

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Solution for 9x2-15x-6=0 equation:



9x^2-15x-6=0
a = 9; b = -15; c = -6;
Δ = b2-4ac
Δ = -152-4·9·(-6)
Δ = 441
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{441}=21$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-15)-21}{2*9}=\frac{-6}{18} =-1/3 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+21}{2*9}=\frac{36}{18} =2 $

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