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10x^2+70x+60=0
a = 10; b = 70; c = +60;
Δ = b2-4ac
Δ = 702-4·10·60
Δ = 2500
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{2500}=50$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(70)-50}{2*10}=\frac{-120}{20} =-6 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(70)+50}{2*10}=\frac{-20}{20} =-1 $
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