3x^2=56+9x

Solution for 3x^2=56+9x equation:

3x^2=56+9x

We move all terms to the left:

3x^2-(56+9x)=0

We add all the numbers together, and all the variables

3x^2-(9x+56)=0

We get rid of parentheses

3x^2-9x-56=0

a = 3; b = -9; c = -56;
Δ = b2-4ac
Δ = -92-4·3·(-56)
Δ = 753
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{-(-9)-\sqrt{753}}{2*3}=\frac{9-\sqrt{753}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{753}}{2*3}=\frac{9+\sqrt{753}}{6}
$