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algebra functions

posted by on .

how do i calculate this

if f(x)= 3x+1 and g(x)=x+2

find (f+g)(x) and calculate (f+g)(1)

a little confused can some one please help me thank you

  • algebra functions - ,

    (f+g) just means to add f and g. Since they're both functions of x, that's why the unfamiliar notation.

    (f+g)(x) = f(x)+g(x) = (3x+1)+(x+2) = 4x+3
    so, (f+g)(1) = 4(1)+3 = 7
    or, you could evaluate f(1)+g(1) = 4+3

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