X2+5x+8=x+5

Solution for X2+5x+8=x+5 equation:

X2+5X+8=X+5

We move all terms to the left:

X2+5X+8-(X+5)=0

We add all the numbers together, and all the variables

X^2+5X-(X+5)+8=0

We get rid of parentheses

X^2+5X-X-5+8=0

We add all the numbers together, and all the variables

X^2+4X+3=0

a = 1; b = 4; c = +3;
Δ = b2-4ac
Δ = 42-4·1·3
Δ = 4
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

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