2x^2+12x=-21

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Solution for 2x^2+12x=-21 equation: 



2x^2+12x=-21

We move all terms to the left:

2x^2+12x-(-21)=0

We add all the numbers together, and all the variables

2x^2+12x+21=0

a = 2; b = 12; c = +21;
Δ = b2-4ac
Δ = 122-4·2·21
Δ = -24
Delta is less than zero, so there is no solution for the equation

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