(x+3)(x-2)=1

Solution for (x+3)(x-2)=1 equation:

(x+3)(x-2)=1

We move all terms to the left:

(x+3)(x-2)-(1)=0

We multiply parentheses ..

(+x^2-2x+3x-6)-1=0

We get rid of parentheses

x^2-2x+3x-6-1=0

We add all the numbers together, and all the variables

x^2+x-7=0

a = 1; b = 1; c = -7;
Δ = b2-4ac
Δ = 12-4·1·(-7)
Δ = 29
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-\sqrt{29}}{2*1}=\frac{-1-\sqrt{29}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{29}}{2*1}=\frac{-1+\sqrt{29}}{2}
$