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0.3s+2(s-0.5)1.3s=12
We move all terms to the left:
0.3s+2(s-0.5)1.3s-(12)=0
We multiply parentheses
2s^2+0.3s-1s-12=0
We add all the numbers together, and all the variables
2s^2-0.7s-12=0
a = 2; b = -0.7; c = -12;
Δ = b2-4ac
Δ = -0.72-4·2·(-12)
Δ = 96.49
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-0.7)-\sqrt{96.49}}{2*2}=\frac{0.7-\sqrt{96.49}}{4} $$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-0.7)+\sqrt{96.49}}{2*2}=\frac{0.7+\sqrt{96.49}}{4} $
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