Which of the following is not a polynomial identity? A. (a^2 + b^2)(c^2 - d^2) = (ac - be)^2 + (ad + bc)

B. a^3 - b^3 = (a - b)(a^2 + ab +b^2)

C. a^2 - b^2 = (a + b)(a - b)

D. (a + b)^2 = a^2 + 2ab+ b^2

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.