Given the function f (x) = x ^ 2-6x + 2, find the range of function f (x)

Given the function f (x) = x ^ 2-6x + 2, find the range of function f (x)

f(x)=x^2-6x+2
=(x^2-6x+9)-7
=(x-3)^2-7》-7
So the range is [- 7, positive infinity)