SOLUTION: Let f(x) = px + q, where p and q are real numbers. Find $p+q$ if $(f(f(x))) = 8x + 21.

Algebra ->  Functions -> SOLUTION: Let f(x) = px + q, where p and q are real numbers. Find $p+q$ if $(f(f(x))) = 8x + 21.      Log On


   

Question 1089844: Let f(x) = px + q, where p and q are real numbers. Find $p+q$ if $(f(f(x))) = 8x + 21.
Found 2 solutions by MathLover1, MathTherapy:
Answer by MathLover1(20849) About Me  (Show Source):
Answer by MathTherapy(10549) About Me  (Show Source):
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Let f(x) = px + q, where p and q are real numbers. Find $p+q$ if $(f(f(x))) = 8x + 21.
If f(f(f(x))) = 8x + 21, then p + q = 5.
If f(f(x)) = 8x + 21, then that's a different story.