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x2-8x-10=18
We move all terms to the left:
x2-8x-10-(18)=0
We add all the numbers together, and all the variables
x^2-8x-28=0
a = 1; b = -8; c = -28;
Δ = b2-4ac
Δ = -82-4·1·(-28)
Δ = 176
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{176}=\sqrt{16*11}=\sqrt{16}*\sqrt{11}=4\sqrt{11}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-4\sqrt{11}}{2*1}=\frac{8-4\sqrt{11}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+4\sqrt{11}}{2*1}=\frac{8+4\sqrt{11}}{2} $
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