Another way to solve this problem
Hello I am in grade 11, I am practicing functions, when I came across this question
Find the range of f(x) = x²-4x+5
To find the range I had to use x= -b/2a and then plug value of x in x²-4x+5 to get the range which is [1, infinity). But using x = -b/2a isn't in my curriculum, so does anyone know any other way to get the range. Idk any other way to find it other than using x=-b/2a.
( this question wasn't in my book, I was practicing questions based on range and domain when I came across this, and also I am a complete beginner to functions, like I literally got taught this topic yesterday)
Also I have noted that completing the square and derivatives can be used to solve this but both of those are not in my curriculum so I cannot use any of those methods