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3x^2-4x=-10
We move all terms to the left:
3x^2-4x-(-10)=0
We add all the numbers together, and all the variables
3x^2-4x+10=0
a = 3; b = -4; c = +10;
Δ = b2-4ac
Δ = -42-4·3·10
Δ = -104
Delta is less than zero, so there is no solution for the equation
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