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0.1t^2-3t-30=0
a = 0.1; b = -3; c = -30;
Δ = b2-4ac
Δ = -32-4·0.1·(-30)
Δ = 21
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-\sqrt{21}}{2*0.1}=\frac{3-\sqrt{21}}{0.2} $$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{21}}{2*0.1}=\frac{3+\sqrt{21}}{0.2} $
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