What type of function is x²+2x+1?
Explanation
A quadratic function is a function that can be expressed in the form f(x) = ax^2 + bx + c where a,b,c are constants and a is not equal to zero. In this case, x² + 2x + 1 can be written as (x + 1)^2 - 1, which satisfies the form of a quadratic function.