3x2-7x=9

Solution for 3x2-7x=9 equation:

3x^2-7x=9

We move all terms to the left:

3x^2-7x-(9)=0

a = 3; b = -7; c = -9;
Δ = b2-4ac
Δ = -72-4·3·(-9)
Δ = 157
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{157}}{2*3}=\frac{7-\sqrt{157}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+\sqrt{157}}{2*3}=\frac{7+\sqrt{157}}{6}
$