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=-Y2-10Y-16
We move all terms to the left:
-(-Y2-10Y-16)=0
We add all the numbers together, and all the variables
-(-1Y^2-10Y-16)=0
We get rid of parentheses
1Y^2+10Y+16=0
We add all the numbers together, and all the variables
Y^2+10Y+16=0
a = 1; b = 10; c = +16;
Δ = b2-4ac
Δ = 102-4·1·16
Δ = 36
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}$$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{36}=6$$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-6}{2*1}=\frac{-16}{2} =-8 $$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+6}{2*1}=\frac{-4}{2} =-2 $
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