3x(+x)-7=78

Solution for 3x(+x)-7=78 equation:

3x(+x)-7=78

We move all terms to the left:

3x(+x)-7-(78)=0

We add all the numbers together, and all the variables

3x(+x)-85=0

We multiply parentheses

3x^2-85=0

a = 3; b = 0; c = -85;
Δ = b2-4ac
Δ = 02-4·3·(-85)
Δ = 1020
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:

$\sqrt{\Delta}=\sqrt{1020}=\sqrt{4*255}=\sqrt{4}*\sqrt{255}=2\sqrt{255}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{255}}{2*3}=\frac{0-2\sqrt{255}}{6}
=-\frac{2\sqrt{255}}{6}
=-\frac{\sqrt{255}}{3}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{255}}{2*3}=\frac{0+2\sqrt{255}}{6}
=\frac{2\sqrt{255}}{6}
=\frac{\sqrt{255}}{3}
$