Y=-3x^2-10x-2

Solution for Y=-3x^2-10x-2 equation:

=-3Y^2-10Y-2

We move all terms to the left:

-(-3Y^2-10Y-2)=0

We get rid of parentheses

3Y^2+10Y+2=0

a = 3; b = 10; c = +2;
Δ = b2-4ac
Δ = 102-4·3·2
Δ = 76
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{76}=\sqrt{4*19}=\sqrt{4}*\sqrt{19}=2\sqrt{19}$
$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-2\sqrt{19}}{2*3}=\frac{-10-2\sqrt{19}}{6}
$
$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+2\sqrt{19}}{2*3}=\frac{-10+2\sqrt{19}}{6}
$