0=x2-5x+1

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Solution for 0=x2-5x+1 equation:



0=x2-5x+1
We move all terms to the left:
0-(x2-5x+1)=0
We add all the numbers together, and all the variables
-(+x^2-5x+1)+0=0
We add all the numbers together, and all the variables
-(+x^2-5x+1)=0
We get rid of parentheses
-x^2+5x-1=0
We add all the numbers together, and all the variables
-1x^2+5x-1=0
a = -1; b = 5; c = -1;
Δ = b2-4ac
Δ = 52-4·(-1)·(-1)
Δ = 21
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-\sqrt{21}}{2*-1}=\frac{-5-\sqrt{21}}{-2} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{21}}{2*-1}=\frac{-5+\sqrt{21}}{-2} $

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