x+9x2-4=0

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Solution for x+9x2-4=0 equation: 



x+9x^2-4=0

a = 9; b = 1; c = -4;
Δ = b2-4ac
Δ = 12-4·9·(-4)
Δ = 145
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{-(1)-\sqrt{145}}{2*9}=\frac{-1-\sqrt{145}}{18}
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{145}}{2*9}=\frac{-1+\sqrt{145}}{18}
$

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