Help me! All please I'm stuck

In Exercises 49-56, find all of the real zeros of the function, finding values whenever possible. Identify each zero as rational or irration 49. f(x) = 23 - 3x2 - 4x + 6 50. f(x) = x3 + 3x2 - 3x - 9 51. f(x ) = x3 + x2 - 8x - 6 52. f(x) = 13 - 6x2 + 7x + 4 53. f(x) = x4 - 3x3 -6.x2 + 6.x + 8 54. f(x) = 14 - x3 - 7x2 + 5x + 10 55. f(x) = 2x4 - 7x3 -2x2 -7x - 4 56. f(x) = 3x4 - 2x3 + 3x2 + x - 2