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=16Y-Y2-13
We move all terms to the left:
-(16Y-Y2-13)=0
We add all the numbers together, and all the variables
-(+16Y-1Y^2-13)=0
We get rid of parentheses
1Y^2-16Y+13=0
We add all the numbers together, and all the variables
Y^2-16Y+13=0
a = 1; b = -16; c = +13;
Δ = b2-4ac
Δ = -162-4·1·13
Δ = 204
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{204}=\sqrt{4*51}=\sqrt{4}*\sqrt{51}=2\sqrt{51}$$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-16)-2\sqrt{51}}{2*1}=\frac{16-2\sqrt{51}}{2} $$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-16)+2\sqrt{51}}{2*1}=\frac{16+2\sqrt{51}}{2} $
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