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For the Given Functions F and G, Find the Requested f(x)=2x31;g(x)=5x2+2f ( x ) = 2 x ^ { 3 } - 1 ; g ( x ) = 5 x ^ { 2 } + 2

Question 239

Multiple Choice

For the given functions f and g, find the requested function and state its domain.
- f(x) =2x31;g(x) =5x2+2f ( x ) = 2 x ^ { 3 } - 1 ; g ( x ) = 5 x ^ { 2 } + 2
Find fgf \cdot g .


A) (fg) (x) =10x5+4x35x22( \mathrm { f } \cdot \mathrm { g } ) ( \mathrm { x } ) = 10 \mathrm { x } ^ { 5 } + 4 \mathrm { x } ^ { 3 } - 5 \mathrm { x } ^ { 2 } - 2 ; all real numbers
B) (fg) (x) =10x6+4x35x22( f \cdot g ) ( x ) = 10 x ^ { 6 } + 4 x ^ { 3 } - 5 x ^ { 2 } - 2 ; all real numbers
C) (fg) (x) =2x3+5x22;( \mathrm { f } \cdot \mathrm { g } ) ( \mathrm { x } ) = 2 \mathrm { x } ^ { 3 } + 5 \mathrm { x } ^ { 2 } - 2 ; all real numbers
D) (fg) (x) =10x5+4x35x22;{xx0}( f \cdot g ) ( x ) = 10 x ^ { 5 } + 4 x ^ { 3 } - 5 x ^ { 2 } - 2 ; \{ x \mid x \neq 0 \}

Correct Answer:

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