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9-3n(n-5)=30
We move all terms to the left:
9-3n(n-5)-(30)=0
We add all the numbers together, and all the variables
-3n(n-5)-21=0
We multiply parentheses
-3n^2+15n-21=0
a = -3; b = 15; c = -21;
Δ = b2-4ac
Δ = 152-4·(-3)·(-21)
Δ = -27
Delta is less than zero, so there is no solution for the equation
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