What is the range of the function f(x) = x^2 - 4x? Algebra Expressions, Equations, and Functions Domain and Range of a Function 1 Answer Sonnhard May 27, 2018 f(x)>=-4 Explanation: We have f(x)=x^2-4x+4-4=(x-2)^2-4>=-4 Answer link Related questions How do you determine if (-1, 4), (2, 8), (-1, 5) is a function? What is the domain for f(x)=2x-4? What is the domain and range for (3,1), (1,-4), and (2, 8)? What is the domain and range of a linear function? Is domain the independent or dependent variable? How do you find the domain and range of a function in interval notation? How do you find domain and range of a rational function? How do you find domain and range of a quadratic function? How do you determine the domain and range of a function? What is Domain and Range of a Function? See all questions in Domain and Range of a Function Impact of this question 1356 views around the world You can reuse this answer Creative Commons License