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18x^2+24x+15x+20=0
We add all the numbers together, and all the variables
18x^2+39x+20=0
a = 18; b = 39; c = +20;
Δ = b2-4ac
Δ = 392-4·18·20
Δ = 81
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{81}=9$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(39)-9}{2*18}=\frac{-48}{36} =-1+1/3 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(39)+9}{2*18}=\frac{-30}{36} =-5/6 $
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