Math (is this correct)

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The functions f and g are defined by:
f:x 3x+1
g:x 9-x

Determine an expression for the function gf(x)
3(9-x)+1
27-3x+1

  • Math (is this correct) -

    yes, but why not combine the 27 and 1?

  • Math (is this correct) -

    3(9-x)+1=27-3x+1

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