1x(8+5x)=4x

Solution for 1x(8+5x)=4x equation:

1x(8+5x)=4x

We move all terms to the left:

1x(8+5x)-(4x)=0

We add all the numbers together, and all the variables

1x(5x+8)-4x=0

We add all the numbers together, and all the variables

-4x+1x(5x+8)=0

We multiply parentheses

5x^2-4x+8x=0

We add all the numbers together, and all the variables

5x^2+4x=0

a = 5; b = 4; c = 0;
Δ = b2-4ac
Δ = 42-4·5·0
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{-(4)-4}{2*5}=\frac{-8}{10}
=-4/5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4}{2*5}=\frac{0}{10}
=0
$