X2-20x+120=2x-1

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Solution for X2-20x+120=2x-1 equation: 



X2-20X+120=2X-1

We move all terms to the left:

X2-20X+120-(2X-1)=0

We add all the numbers together, and all the variables

X^2-20X-(2X-1)+120=0

We get rid of parentheses

X^2-20X-2X+1+120=0

We add all the numbers together, and all the variables

X^2-22X+121=0

a = 1; b = -22; c = +121;
Δ = b2-4ac
Δ = -222-4·1·121
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$X=\frac{-b}{2a}=\frac{22}{2}=11$

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