81=1+(n-1)4

Solution for 81=1+(n-1)4 equation:

81=1+(n-1)4

We move all terms to the left:

81-(1+(n-1)4)=0


We calculate terms in parentheses: -(1+(n-1)4), so:

1+(n-1)4

determiningTheFunctionDomain
(n-1)4+1

We multiply parentheses

4n-4+1

We add all the numbers together, and all the variables

4n-3

Back to the equation:

-(4n-3)


We get rid of parentheses

-4n+3+81=0

We add all the numbers together, and all the variables

-4n+84=0

We move all terms containing n to the left, all other terms to the right

-4n=-84

n=-84/-4

n=+21