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13x-2(3x+6)6x+12=42
We move all terms to the left:
13x-2(3x+6)6x+12-(42)=0
We add all the numbers together, and all the variables
13x-2(3x+6)6x-30=0
We multiply parentheses
-36x^2+13x-72x-30=0
We add all the numbers together, and all the variables
-36x^2-59x-30=0
a = -36; b = -59; c = -30;
Δ = b2-4ac
Δ = -592-4·(-36)·(-30)
Δ = -839
Delta is less than zero, so there is no solution for the equation
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