(a+3)(a-2)=-5

Solution for (a+3)(a-2)=-5 equation:

(a+3)(a-2)=-5

We move all terms to the left:

(a+3)(a-2)-(-5)=0

We add all the numbers together, and all the variables

(a+3)(a-2)+5=0

We multiply parentheses ..

(+a^2-2a+3a-6)+5=0

We get rid of parentheses

a^2-2a+3a-6+5=0

We add all the numbers together, and all the variables

a^2+a-1=0

a = 1; b = 1; c = -1;
Δ = b2-4ac
Δ = 12-4·1·(-1)
Δ = 5
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

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