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x+4x^2=72
We move all terms to the left:
x+4x^2-(72)=0
a = 4; b = 1; c = -72;
Δ = b2-4ac
Δ = 12-4·4·(-72)
Δ = 1153
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{-(1)-\sqrt{1153}}{2*4}=\frac{-1-\sqrt{1153}}{8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{1153}}{2*4}=\frac{-1+\sqrt{1153}}{8} $
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