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

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

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

We move all terms to the left:

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

We multiply parentheses

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

We add all the numbers together, and all the variables

2x^2-7x-3=0

a = 2; b = -7; c = -3;
Δ = b2-4ac
Δ = -72-4·2·(-3)
Δ = 73
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7)-\sqrt{73}}{2*2}=\frac{7-\sqrt{73}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+\sqrt{73}}{2*2}=\frac{7+\sqrt{73}}{4}
$