Y=-7x^2-11x

Solution for Y=-7x^2-11x equation:

=-7Y^2-11Y

We move all terms to the left:

-(-7Y^2-11Y)=0

We get rid of parentheses

7Y^2+11Y=0

a = 7; b = 11; c = 0;
Δ = b2-4ac
Δ = 112-4·7·0
Δ = 121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{121}=11$
$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(11)-11}{2*7}=\frac{-22}{14}
=-1+4/7
$
$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+11}{2*7}=\frac{0}{14}
=0
$