y2-2=3y+18

Solution for y2-2=3y+18 equation:

y2-2=3y+18

We move all terms to the left:

y2-2-(3y+18)=0

We add all the numbers together, and all the variables

y^2-(3y+18)-2=0

We get rid of parentheses

y^2-3y-18-2=0

We add all the numbers together, and all the variables

y^2-3y-20=0

a = 1; b = -3; c = -20;
Δ = b2-4ac
Δ = -32-4·1·(-20)
Δ = 89
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-\sqrt{89}}{2*1}=\frac{3-\sqrt{89}}{2}
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{89}}{2*1}=\frac{3+\sqrt{89}}{2}
$