12(2x+5)=2x(x+5)

Solution for 12(2x+5)=2x(x+5) equation:

12(2x+5)=2x(x+5)

We move all terms to the left:

12(2x+5)-(2x(x+5))=0

We multiply parentheses

24x-(2x(x+5))+60=0


We calculate terms in parentheses: -(2x(x+5)), so:

2x(x+5)

We multiply parentheses

2x^2+10x

Back to the equation:

-(2x^2+10x)


We get rid of parentheses

-2x^2+24x-10x+60=0

We add all the numbers together, and all the variables

-2x^2+14x+60=0

a = -2; b = 14; c = +60;
Δ = b2-4ac
Δ = 142-4·(-2)·60
Δ = 676
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{676}=26$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-26}{2*-2}=\frac{-40}{-4}
=+10
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+26}{2*-2}=\frac{12}{-4}
=-3
$