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4x^2-8x+19=15
We move all terms to the left:
4x^2-8x+19-(15)=0
We add all the numbers together, and all the variables
4x^2-8x+4=0
a = 4; b = -8; c = +4;
Δ = b2-4ac
Δ = -82-4·4·4
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{8}{8}=1$
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