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5x(x+2)=5x+10x
We move all terms to the left:
5x(x+2)-(5x+10x)=0
We add all the numbers together, and all the variables
5x(x+2)-(+15x)=0
We multiply parentheses
5x^2+10x-(+15x)=0
We get rid of parentheses
5x^2+10x-15x=0
We add all the numbers together, and all the variables
5x^2-5x=0
a = 5; b = -5; c = 0;
Δ = b2-4ac
Δ = -52-4·5·0
Δ = 25
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{25}=5$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-5)-5}{2*5}=\frac{0}{10} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+5}{2*5}=\frac{10}{10} =1 $
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