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3x^2-61x+300=0
a = 3; b = -61; c = +300;
Δ = b2-4ac
Δ = -612-4·3·300
Δ = 121
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{121}=11$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-61)-11}{2*3}=\frac{50}{6} =8+1/3 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-61)+11}{2*3}=\frac{72}{6} =12 $
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