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15x^2+5x-6=0
a = 15; b = 5; c = -6;
Δ = b2-4ac
Δ = 52-4·15·(-6)
Δ = 385
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{385}}{2*15}=\frac{-5-\sqrt{385}}{30} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{385}}{2*15}=\frac{-5+\sqrt{385}}{30} $
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