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3x(10x-3x-1)=0
We add all the numbers together, and all the variables
3x(7x-1)=0
We multiply parentheses
21x^2-3x=0
a = 21; b = -3; c = 0;
Δ = b2-4ac
Δ = -32-4·21·0
Δ = 9
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{9}=3$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-3}{2*21}=\frac{0}{42} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+3}{2*21}=\frac{6}{42} =1/7 $
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