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3n(5n-6)=10
We move all terms to the left:
3n(5n-6)-(10)=0
We multiply parentheses
15n^2-18n-10=0
a = 15; b = -18; c = -10;
Δ = b2-4ac
Δ = -182-4·15·(-10)
Δ = 924
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}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{924}=\sqrt{4*231}=\sqrt{4}*\sqrt{231}=2\sqrt{231}$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-18)-2\sqrt{231}}{2*15}=\frac{18-2\sqrt{231}}{30} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-18)+2\sqrt{231}}{2*15}=\frac{18+2\sqrt{231}}{30} $
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