x(x-4)+3x=30

Solution for x(x-4)+3x=30 equation:

x(x-4)+3x=30

We move all terms to the left:

x(x-4)+3x-(30)=0

We add all the numbers together, and all the variables

3x+x(x-4)-30=0

We multiply parentheses

x^2+3x-4x-30=0

We add all the numbers together, and all the variables

x^2-1x-30=0

a = 1; b = -1; c = -30;
Δ = b2-4ac
Δ = -12-4·1·(-30)
Δ = 121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{121}=11$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-11}{2*1}=\frac{-10}{2}
=-5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+11}{2*1}=\frac{12}{2}
=6
$