Find a linear approximation to f(x) = (1 + x) at x = 0. where a is

Question:

Find a linear approximation to f(x) = (1 + x)α at x = 0. where a is any number. For various values of a, plot f(x) and its linear approximation L(x). For what values of a does the linear approximation always overestimate f(x)? For what values of a does the linear approximation always underestimate f(x)?