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20x^2+80x^2=-6x
We move all terms to the left:
20x^2+80x^2-(-6x)=0
We add all the numbers together, and all the variables
100x^2-(-6x)=0
We get rid of parentheses
100x^2+6x=0
a = 100; b = 6; c = 0;
Δ = b2-4ac
Δ = 62-4·100·0
Δ = 36
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{36}=6$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-6}{2*100}=\frac{-12}{200} =-3/50 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+6}{2*100}=\frac{0}{200} =0 $
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