9-3n(n-5)=30

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Solution for 9-3n(n-5)=30 equation: 



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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