36x^2+4x-9=0

Solution for 36x^2+4x-9=0 equation:

36x^2+4x-9=0

a = 36; b = 4; c = -9;
Δ = b2-4ac
Δ = 42-4·36·(-9)
Δ = 1312
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1312}=\sqrt{16*82}=\sqrt{16}*\sqrt{82}=4\sqrt{82}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-4\sqrt{82}}{2*36}=\frac{-4-4\sqrt{82}}{72}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4\sqrt{82}}{2*36}=\frac{-4+4\sqrt{82}}{72}
$