I need help please. Thank you.

2(n-1)+4n=2(3n-1)n=0no solutioninfinitely many solutions n= - 4 !

Y=4x^2+x-1 solve using quadratic formula

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]