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5x^2-9=5x
We move all terms to the left:
5x^2-9-(5x)=0
a = 5; b = -5; c = -9;
Δ = b2-4ac
Δ = -52-4·5·(-9)
Δ = 205
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{-(-5)-\sqrt{205}}{2*5}=\frac{5-\sqrt{205}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{205}}{2*5}=\frac{5+\sqrt{205}}{10} $
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