15=-0.00635x^2+630

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Solution for 15=-0.00635x^2+630 equation: 



15=-0.00635x^2+630

We move all terms to the left:

15-(-0.00635x^2+630)=0

We get rid of parentheses

0.00635x^2-630+15=0

We add all the numbers together, and all the variables

0.00635x^2-615=0

a = 0.00635; b = 0; c = -615;
Δ = b2-4ac
Δ = 02-4·0.00635·(-615)
Δ = 15.621
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{15.621}}{2*0.00635}=\frac{0-\sqrt{15.621}}{0.0127}
=-\frac{\sqrt{}}{0.0127}
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{15.621}}{2*0.00635}=\frac{0+\sqrt{15.621}}{0.0127}
=\frac{\sqrt{}}{0.0127}
$

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