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x^2-8x=29
We move all terms to the left:
x^2-8x-(29)=0
a = 1; b = -8; c = -29;
Δ = b2-4ac
Δ = -82-4·1·(-29)
Δ = 180
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{180}=\sqrt{36*5}=\sqrt{36}*\sqrt{5}=6\sqrt{5}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-6\sqrt{5}}{2*1}=\frac{8-6\sqrt{5}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+6\sqrt{5}}{2*1}=\frac{8+6\sqrt{5}}{2} $
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