x(x+3)+3(x+7)=0

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Solution for x(x+3)+3(x+7)=0 equation: 



x(x+3)+3(x+7)=0

We multiply parentheses

x^2+3x+3x+21=0

We add all the numbers together, and all the variables

x^2+6x+21=0

a = 1; b = 6; c = +21;
Δ = b2-4ac
Δ = 62-4·1·21
Δ = -48
Delta is less than zero, so there is no solution for the equation

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