3x(x-2)+11=2(x+5)

Solution for 3x(x-2)+11=2(x+5) equation:

3x(x-2)+11=2(x+5)

We move all terms to the left:

3x(x-2)+11-(2(x+5))=0

We multiply parentheses

3x^2-6x-(2(x+5))+11=0


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

2(x+5)

We multiply parentheses

2x+10

Back to the equation:

-(2x+10)


We get rid of parentheses

3x^2-6x-2x-10+11=0

We add all the numbers together, and all the variables

3x^2-8x+1=0

a = 3; b = -8; c = +1;
Δ = b2-4ac
Δ = -82-4·3·1
Δ = 52
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{52}=\sqrt{4*13}=\sqrt{4}*\sqrt{13}=2\sqrt{13}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-2\sqrt{13}}{2*3}=\frac{8-2\sqrt{13}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+2\sqrt{13}}{2*3}=\frac{8+2\sqrt{13}}{6}
$