Please help me with 77 and 89. For 77, it asks you to expand the expression in the difference quotient and simplify the expression.

77. f (x) = x3 78. f (x) = x4 79. A(x) = 20 80. Ax) = x8 82. f (x) = 1 $1. f(x) = x In Exercises 83-96, use the Binomial Theorem to expand he complex number. Simplify your result. (Remember that = /-1. 83. (1 + i)+ 84. (4 - i)s 85. (4 + 1 )4 86. (2 - i)s 87. (2 - 31)6 88. (3 - 21)6 89. (5 + V-163 90. (5 + V-9)