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0.1x^2+2x+10=30
We move all terms to the left:
0.1x^2+2x+10-(30)=0
We add all the numbers together, and all the variables
0.1x^2+2x-20=0
a = 0.1; b = 2; c = -20;
Δ = b2-4ac
Δ = 22-4·0.1·(-20)
Δ = 12
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{12}=\sqrt{4*3}=\sqrt{4}*\sqrt{3}=2\sqrt{3}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{3}}{2*0.1}=\frac{-2-2\sqrt{3}}{0.2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{3}}{2*0.1}=\frac{-2+2\sqrt{3}}{0.2} $
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