4(x+3)=x2+11

Solution for 4(x+3)=x2+11 equation:

4(x+3)=x2+11

We move all terms to the left:

4(x+3)-(x2+11)=0

We add all the numbers together, and all the variables

-(+x^2+11)+4(x+3)=0

We multiply parentheses

-(+x^2+11)+4x+12=0

We get rid of parentheses

-x^2+4x-11+12=0

We add all the numbers together, and all the variables

-1x^2+4x+1=0

a = -1; b = 4; c = +1;
Δ = b2-4ac
Δ = 42-4·(-1)·1
Δ = 20
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{20}=\sqrt{4*5}=\sqrt{4}*\sqrt{5}=2\sqrt{5}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-2\sqrt{5}}{2*-1}=\frac{-4-2\sqrt{5}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+2\sqrt{5}}{2*-1}=\frac{-4+2\sqrt{5}}{-2}
$