0,7x2-70=0

Solution for 0,7x2-70=0 equation:

0.7x^2-70=0

a = 0.7; b = 0; c = -70;
Δ = b2-4ac
Δ = 02-4·0.7·(-70)
Δ = 196
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{196}=14$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-14}{2*0.7}=\frac{-14}{1.4}
=-10
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+14}{2*0.7}=\frac{14}{1.4}
=10
$