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(-6*5x+4x*5x)=0
We get rid of parentheses
-6*5x+4x*5x=0
Wy multiply elements
20x^2-30x=0
a = 20; b = -30; c = 0;
Δ = b2-4ac
Δ = -302-4·20·0
Δ = 900
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{900}=30$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-30}{2*20}=\frac{0}{40} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+30}{2*20}=\frac{60}{40} =1+1/2 $
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