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2x(9x-5)=x
We move all terms to the left:
2x(9x-5)-(x)=0
We add all the numbers together, and all the variables
-1x+2x(9x-5)=0
We multiply parentheses
18x^2-1x-10x=0
We add all the numbers together, and all the variables
18x^2-11x=0
a = 18; b = -11; c = 0;
Δ = b2-4ac
Δ = -112-4·18·0
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$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-11)-11}{2*18}=\frac{0}{36} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-11)+11}{2*18}=\frac{22}{36} =11/18 $
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