Chapter 1.4, Problem 97E

Exercises 73-88: Identifr where f is increasing and where f

is decreasing. (Hint: Consider the graph y = f(x).)

73. f(x) = 2x - 1 74. f(x) = 4 - x

75. f(x) = x²- 2 76.f(x) = $-\frac{1}{2}{x}_{}^2$

77. f(x) = 2x - x²

78.f(x) = x² - 4x

79.f(x) = $\sqrt{x-1}$ 80.f(x) = $\sqrt{x+1}$

81.f(x) = |x + 3| 80.f(x) = |x - 1|

83. f(x) = x³ 84.f(x) = 3 $\sqrt{x}$

85. f(x) = $\frac{1}{3}x$ 3- 4x 86.f(x) = x³- 3x

87. f(x) = $\frac{1}{4}x$ 4 + $\frac{1}{3}x$ 3 + x² 88. f(x) = $\frac{1}{4}x$ 4 -2x²