Find the function represented by the following series and find the interval of convergence of the series. Sigma Infinity k=0[x^2+3/4]^k. The function represented by the series Sigma Infinity k=0[x^2+3/4]^k is f(x)= The interval of convergence is (Simplify your answer. Type your answer in interval notation. Type an exact answer, using radicals as needed.)