Y=-0.6x^2+2.5

Solution for Y=-0.6x^2+2.5 equation:

=-0.6Y^2+2.5

We move all terms to the left:

-(-0.6Y^2+2.5)=0

We get rid of parentheses

0.6Y^2-2.5=0

a = 0.6; b = 0; c = -2.5;
Δ = b2-4ac
Δ = 02-4·0.6·(-2.5)
Δ = 6
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{-(0)-\sqrt{6}}{2*0.6}=\frac{0-\sqrt{6}}{1.2}
=-\frac{\sqrt{}}{1.2}
$
$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{6}}{2*0.6}=\frac{0+\sqrt{6}}{1.2}
=\frac{\sqrt{}}{1.2}
$