a(a+3)+4(a+3)=

Solution for a(a+3)+4(a+3)= equation:

a(a+3)+4(a+3)=

We move all terms to the left:

a(a+3)+4(a+3)-()=0

We add all the numbers together, and all the variables

a(a+3)+4(a+3)=0

We multiply parentheses

a^2+3a+4a+12=0

We add all the numbers together, and all the variables

a^2+7a+12=0

a = 1; b = 7; c = +12;
Δ = b2-4ac
Δ = 72-4·1·12
Δ = 1
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1}=1$
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-1}{2*1}=\frac{-8}{2}
=-4
$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+1}{2*1}=\frac{-6}{2}
=-3
$