SOLUTION: If {{{ f(x) = 2sqrt (x) }}} and {{{ g(x) = 2+2x }}} find the exact value of: {{{ f(f(81)) }}}

Algebra ->  Functions -> SOLUTION: If {{{ f(x) = 2sqrt (x) }}} and {{{ g(x) = 2+2x }}} find the exact value of: {{{ f(f(81)) }}}       Log On


   

Question 951032: If +f%28x%29+=+2sqrt+%28x%29+ and +g%28x%29+=+2%2B2x+ find the exact value of:
+f%28f%2881%29%29+

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

If +f%28x%29+=+2sqrt+%28x%29+ and +g%28x%29+=+2%2B2x+ find the exact value of:
+f%28f%2881%29%29+
+f%2881%29=2sqrt+%2881%29+
+f%2881%29=2%2A9+
+f%2881%29=18+
+f%28f%2881%29%29=f%2818%29+
+f%28f%2881%29%29=2sqrt+%2818%29+
+f%28f%2881%29%29=2sqrt+%282%2A9%29+
+f%28f%2881%29%29=2%2A3sqrt+%282%29+
+f%28f%2881%29%29=6sqrt+%282%29+