
                       Review of Functions and Equations
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                                 _________
                            3    ▌              2
         If        f(x) = 2x  + \▌ 5x + 2   + 4x
                                   ___________
                              3    ▌                  2
         then      f(3) = 2(3)  + \▌ 5(3) + 2   + 4(3)

                                       _______________
                                  3    ▌                          2
         and   f(x + h) = 2(x + h)  + \▌ 5(x + h) + 2   + 4(x + h)



                         2
         If            ax  + bx + c  =  O    then
                                 ___________
                                 ▌  2
                           -b ± \▌ b  - 4ac
                  x   =   ────────────────────
                                  2a

┌─────────────────┐
│ Common Mistakes │
└─────────────────┘


WRONG       f(a + b) = f(a) + f(b)     RIGHT  No formula for   f(a + b)

WRONG       f(a + b) = f(a) + b        RIGHT  No formula for   f(a + b)

WRONG       Solving  x f(x) = O     and forgetting that  x = O is a solution.

WRONG       Solving  f(x)/x = O     and thinking that  x = O is a solution.


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