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-2n(n+3)=-10
We move all terms to the left:
-2n(n+3)-(-10)=0
We add all the numbers together, and all the variables
-2n(n+3)+10=0
We multiply parentheses
-2n^2-6n+10=0
a = -2; b = -6; c = +10;
Δ = b2-4ac
Δ = -62-4·(-2)·10
Δ = 116
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{116}=\sqrt{4*29}=\sqrt{4}*\sqrt{29}=2\sqrt{29}$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-2\sqrt{29}}{2*-2}=\frac{6-2\sqrt{29}}{-4} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+2\sqrt{29}}{2*-2}=\frac{6+2\sqrt{29}}{-4} $
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