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4x^2+6.5x+0.5x+13=0
We add all the numbers together, and all the variables
4x^2+7x+13=0
a = 4; b = 7; c = +13;
Δ = b2-4ac
Δ = 72-4·4·13
Δ = -159
Delta is less than zero, so there is no solution for the equation
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