If two times the square of a number minus 5 times that number is 35, then what is the number?

Let "n" be the variable for the number-
In number form, this problem is-
(2)n^2-5=35
First, add 5 to both sides
(2)n^2-5+5=35+5
2n^2=40
Divide by 2
n^2=20
Find the square root of both sides-
n= Square root of 20 
n=  2
Approximately- 4.4721....