-27=-4.9x^2

Solution for -27=-4.9x^2 equation:

-27=-4.9x^2

We move all terms to the left:

-27-(-4.9x^2)=0

We get rid of parentheses

4.9x^2-27=0

a = 4.9; b = 0; c = -27;
Δ = b2-4ac
Δ = 02-4·4.9·(-27)
Δ = 529.2
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{529.2}}{2*4.9}=\frac{0-\sqrt{529.2}}{9.8}
=-\frac{\sqrt{}}{9.8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{529.2}}{2*4.9}=\frac{0+\sqrt{529.2}}{9.8}
=\frac{\sqrt{}}{9.8}
$