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=10Y^2+38Y+30
We move all terms to the left:
-(10Y^2+38Y+30)=0
We get rid of parentheses
-10Y^2-38Y-30=0
a = -10; b = -38; c = -30;
Δ = b2-4ac
Δ = -382-4·(-10)·(-30)
Δ = 244
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}$$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{244}=\sqrt{4*61}=\sqrt{4}*\sqrt{61}=2\sqrt{61}$$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-38)-2\sqrt{61}}{2*-10}=\frac{38-2\sqrt{61}}{-20} $$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-38)+2\sqrt{61}}{2*-10}=\frac{38+2\sqrt{61}}{-20} $
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