3x(x-5)-10=1

Solution for 3x(x-5)-10=1 equation:

3x(x-5)-10=1

We move all terms to the left:

3x(x-5)-10-(1)=0

We add all the numbers together, and all the variables

3x(x-5)-11=0

We multiply parentheses

3x^2-15x-11=0

a = 3; b = -15; c = -11;
Δ = b2-4ac
Δ = -152-4·3·(-11)
Δ = 357
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{-(-15)-\sqrt{357}}{2*3}=\frac{15-\sqrt{357}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+\sqrt{357}}{2*3}=\frac{15+\sqrt{357}}{6}
$