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5x^2-3x=15
We move all terms to the left:
5x^2-3x-(15)=0
a = 5; b = -3; c = -15;
Δ = b2-4ac
Δ = -32-4·5·(-15)
Δ = 309
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{-(-3)-\sqrt{309}}{2*5}=\frac{3-\sqrt{309}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{309}}{2*5}=\frac{3+\sqrt{309}}{10} $
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