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x^2+(2.6)x+3.6=0
We multiply parentheses
x^2+2.6x+3.6=0
a = 1; b = 2.6; c = +3.6;
Δ = b2-4ac
Δ = 2.62-4·1·3.6
Δ = -7.64
Delta is less than zero, so there is no solution for the equation
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