document.write( "Question 286963: if f(x)= $\"5x%5E2\"$ and g(x)= square root 2x, what is the value of (f*g)(8)
\n" ); document.write( "i think i need to substitute f(x) to f and g(x) to g to get:
\n" ); document.write( " $\"%285x%5E2%29\"$ * (square root 2x) (8) but after this i dont know what to do \n" ); document.write( "

Algebra.Com's Answer #208074 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Substitute g(x) for x in f(x).
\n" ); document.write( " $\"f%28x%29=5x%5E2\"$
\n" ); document.write( " $\"f%28g%28x%29%29=5%28g%28x%29%29%5E2=5%28sqrt%282x%29%29%5E2=5%282x%29=10x\"$
\n" ); document.write( "So then
\n" ); document.write( " $\"f%28g%288%29%29=10%288%29=80\"$ \n" ); document.write( "

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