5. ( f o g )(x) = f[ g(x) ]
= f(3x)
= 2(3x) + 4
= 6x + 4
( ( f o g ) o h )(x) = ( f o g )[ h(x) ]
= ( f o g )( x² + 1 )
= 6( x² + 1 ) + 4
= 6x² + 6 + 4
= 6x² + 10
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5. ( f o g )(x) = f[ g(x) ]
= f(3x)
= 2(3x) + 4
= 6x + 4
( ( f o g ) o h )(x) = ( f o g )[ h(x) ]
= ( f o g )( x² + 1 )
= 6( x² + 1 ) + 4
= 6x² + 6 + 4
= 6x² + 10