x^2+15=-4x

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Solution for x^2+15=-4x equation: 



x^2+15=-4x

We move all terms to the left:

x^2+15-(-4x)=0

We get rid of parentheses

x^2+4x+15=0

a = 1; b = 4; c = +15;
Δ = b2-4ac
Δ = 42-4·1·15
Δ = -44
Delta is less than zero, so there is no solution for the equation

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