-3x(x-5)-2(2x+1)=-2=

Solution for -3x(x-5)-2(2x+1)=-2= equation:

-3x(x-5)-2(2x+1)=-2=

We move all terms to the left:

-3x(x-5)-2(2x+1)-(-2)=0

We add all the numbers together, and all the variables

-3x(x-5)-2(2x+1)+2=0

We multiply parentheses

-3x^2+15x-4x-2+2=0

We add all the numbers together, and all the variables

-3x^2+11x=0

a = -3; b = 11; c = 0;
Δ = b2-4ac
Δ = 112-4·(-3)·0
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{-(11)-11}{2*-3}=\frac{-22}{-6}
=3+2/3
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+11}{2*-3}=\frac{0}{-6}
=0
$