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x2+18x-4=-3
We move all terms to the left:
x2+18x-4-(-3)=0
We add all the numbers together, and all the variables
x^2+18x-1=0
a = 1; b = 18; c = -1;
Δ = b2-4ac
Δ = 182-4·1·(-1)
Δ = 328
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{328}=\sqrt{4*82}=\sqrt{4}*\sqrt{82}=2\sqrt{82}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(18)-2\sqrt{82}}{2*1}=\frac{-18-2\sqrt{82}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(18)+2\sqrt{82}}{2*1}=\frac{-18+2\sqrt{82}}{2} $
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