Determine the domain of each function. x2 - 25 x² - 4 79. f(x) 80. f(x) x - 5 x + 2 x3 x* + 7 81. f(x) 82. f(x) = x2 - 5x + 6 x2 + 6x + 5 83. f(x) = V5x + 4 84. f(x) - V2x – 6 85. f(x) = V7 – x 86. f(x) = V5 - x ||

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