(x+7)(x+3)/(x+5)^2=0

Solution for (x+7)(x+3)/(x+5)^2=0 equation:

(x+7)(x+3)/(x+5)^2=0


Domain of the equation: (x+5)^2!=0

x∈R


We multiply parentheses ..

(+x^2+3x+7x+21)/(x+5)^2=0

We multiply all the terms by the denominator


(+x^2+3x+7x+21)=0

We get rid of parentheses

x^2+3x+7x+21=0

We add all the numbers together, and all the variables

x^2+10x+21=0

a = 1; b = 10; c = +21;
Δ = b2-4ac
Δ = 102-4·1·21
Δ = 16
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{16}=4$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-4}{2*1}=\frac{-14}{2}
=-7
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+4}{2*1}=\frac{-6}{2}
=-3
$