-98x2=-18

Solution for -98x2=-18 equation:

-98x^2=-18

We move all terms to the left:

-98x^2-(-18)=0

We add all the numbers together, and all the variables

-98x^2+18=0

a = -98; b = 0; c = +18;
Δ = b2-4ac
Δ = 02-4·(-98)·18
Δ = 7056
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{7056}=84$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-84}{2*-98}=\frac{-84}{-196}
=3/7
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+84}{2*-98}=\frac{84}{-196}
=-3/7
$