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0.02x^2+3x+72=0
a = 0.02; b = 3; c = +72;
Δ = b2-4ac
Δ = 32-4·0.02·72
Δ = 3.24
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{-(3)-\sqrt{3.24}}{2*0.02}=\frac{-3-\sqrt{3.24}}{0.04} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{3.24}}{2*0.02}=\frac{-3+\sqrt{3.24}}{0.04} $
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