5x-1=x2-1

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Solution for 5x-1=x2-1 equation:



5x-1=x2-1
We move all terms to the left:
5x-1-(x2-1)=0
We add all the numbers together, and all the variables
-(+x^2-1)+5x-1=0
We get rid of parentheses
-x^2+5x+1-1=0
We add all the numbers together, and all the variables
-1x^2+5x=0
a = -1; b = 5; c = 0;
Δ = b2-4ac
Δ = 52-4·(-1)·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*-1}=\frac{-10}{-2} =+5 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+5}{2*-1}=\frac{0}{-2} =0 $

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