Consider the following function.x2x - 49(a) Find the critical numbers of f. (Enter your answers as a comma-separated list.)x = (0,0)=(b) Find the open intervals

Consider the following function.x2x² - 49(a) Find the critical numbers of f. (Enter your answers as a comma-separated list.)x = (0,0)=(b) Find the open intervals on which the function is increasing or decreasing. (Enter your answers using interval notation. If ananswer does not exist, enter DNE.)(-?, -7) U(-7,0)(0,7) U (7,00)increasingdecreasingX(c) Apply the First Derivative Test to identify the relative extremum. (If an answer does not exist, enter DNE.)relative maximum (x, y) =(DNE* )relative minimum(x, y) =DNE)