Y=-4.9x^2+9.8

Solution for Y=-4.9x^2+9.8 equation:

=-4.9Y^2+9.8

We move all terms to the left:

-(-4.9Y^2+9.8)=0

We get rid of parentheses

4.9Y^2-9.8=0

a = 4.9; b = 0; c = -9.8;
Δ = b2-4ac
Δ = 02-4·4.9·(-9.8)
Δ = 192.08
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{192.08}}{2*4.9}=\frac{0-\sqrt{192.08}}{9.8}
=-\frac{\sqrt{}}{9.8}
$
$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{192.08}}{2*4.9}=\frac{0+\sqrt{192.08}}{9.8}
=\frac{\sqrt{}}{9.8}
$