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4x^2-8x=-19
We move all terms to the left:
4x^2-8x-(-19)=0
We add all the numbers together, and all the variables
4x^2-8x+19=0
a = 4; b = -8; c = +19;
Δ = b2-4ac
Δ = -82-4·4·19
Δ = -240
Delta is less than zero, so there is no solution for the equation
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