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20x=(x^2)+10x+25
We move all terms to the left:
20x-((x^2)+10x+25)=0
We get rid of parentheses
-x^2+20x-10x-25=0
We add all the numbers together, and all the variables
-1x^2+10x-25=0
a = -1; b = 10; c = -25;
Δ = b2-4ac
Δ = 102-4·(-1)·(-25)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{-10}{-2}=+5$
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