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10z^2-15z-4z-6=0
We add all the numbers together, and all the variables
10z^2-19z-6=0
a = 10; b = -19; c = -6;
Δ = b2-4ac
Δ = -192-4·10·(-6)
Δ = 601
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-19)-\sqrt{601}}{2*10}=\frac{19-\sqrt{601}}{20} $$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-19)+\sqrt{601}}{2*10}=\frac{19+\sqrt{601}}{20} $
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