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9x^2-2x-2025=0
a = 9; b = -2; c = -2025;
Δ = b2-4ac
Δ = -22-4·9·(-2025)
Δ = 72904
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{72904}=\sqrt{4*18226}=\sqrt{4}*\sqrt{18226}=2\sqrt{18226}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2\sqrt{18226}}{2*9}=\frac{2-2\sqrt{18226}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2\sqrt{18226}}{2*9}=\frac{2+2\sqrt{18226}}{18} $
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