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X2-16X+7=0
We add all the numbers together, and all the variables
X^2-16X+7=0
a = 1; b = -16; c = +7;
Δ = b2-4ac
Δ = -162-4·1·7
Δ = 228
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{228}=\sqrt{4*57}=\sqrt{4}*\sqrt{57}=2\sqrt{57}$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-16)-2\sqrt{57}}{2*1}=\frac{16-2\sqrt{57}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-16)+2\sqrt{57}}{2*1}=\frac{16+2\sqrt{57}}{2} $
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