Question 641633
3n^2+10=85


3n^2+10-10=85-10


3n^2=75


n^2=75/3


n^2=25


n^2-25 = 0


n^2-5^2 = 0


(n-5)(n+5) = 0


n-5 = 0 or n+5 = 0


n = 5 or n = -5


So the solutions are n = 5 or n = -5