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5c^2-26c+5=0
a = 5; b = -26; c = +5;
Δ = b2-4ac
Δ = -262-4·5·5
Δ = 576
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{576}=24$$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-26)-24}{2*5}=\frac{2}{10} =1/5 $$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-26)+24}{2*5}=\frac{50}{10} =5 $
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