2x(5x+1)=5x+1

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Solution for 2x(5x+1)=5x+1 equation:



2x(5x+1)=5x+1
We move all terms to the left:
2x(5x+1)-(5x+1)=0
We multiply parentheses
10x^2+2x-(5x+1)=0
We get rid of parentheses
10x^2+2x-5x-1=0
We add all the numbers together, and all the variables
10x^2-3x-1=0
a = 10; b = -3; c = -1;
Δ = b2-4ac
Δ = -32-4·10·(-1)
Δ = 49
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{49}=7$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-7}{2*10}=\frac{-4}{20} =-1/5 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+7}{2*10}=\frac{10}{20} =1/2 $

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