x(13+4x)=-10

Solution for x(13+4x)=-10 equation:

x(13+4x)=-10

We move all terms to the left:

x(13+4x)-(-10)=0

We add all the numbers together, and all the variables

x(4x+13)-(-10)=0

We add all the numbers together, and all the variables

x(4x+13)+10=0

We multiply parentheses

4x^2+13x+10=0

a = 4; b = 13; c = +10;
Δ = b2-4ac
Δ = 132-4·4·10
Δ = 9
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{9}=3$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(13)-3}{2*4}=\frac{-16}{8}
=-2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13)+3}{2*4}=\frac{-10}{8}
=-1+1/4
$