Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
Morgan
Morgan asked in Science & MathematicsMathematics · 4 years ago

Algebra II help? Functions and Relations?

1. find f of g when f(x)=3x and g(x)=x+1

a. 4x+1

b. 3x+1

c. 3x2+1

d. 3x+3

2. Find g of x when f(x)=x+7 and g(x)=3x-2

a. 3x+5

b. 3x+19

c. 3x-5

d. -3x-19

anything helps thanks you!!

4 Answers

Relevance
  • cidyah
    Lv 7
    4 years ago

    1.

    f(x) = 3x

    g(x) = x+1

    f(g(x)) = f(x+1) = 3(x+1) = 3x+3

    2.

    f(x) = x+7 , g(x) = 3x-2

    g (f(x) ) = g(x+7) = 3(x+7)-2 = 3x+21-2 = 3x+19

  • Johnathan
    Lv 7
    4 years ago

    1) f o g = f(x + 1) = 3(x + 1) = 3x + 3. D).

    2) You got g(x) already. If you mean g o f, that is g(x + 7) = 3(x + 7) - 2 = 3x + 21 - 2 = 3x + 19. B).

  • ?
    Lv 7
    4 years ago

    1. (f o g)(x)) = f(g(x))

    = f(x + 1) = 3(x + 1)

    d. 3x+3

    2. g of f ?

    g(f(x)) = g(x + 7)

    = 3(x + 7) - 2

    = 3x + 19

    b. 3x+19

  • ?
    4 years ago

    f(g(x)) = 3(g(x))

    f(g(x)) = 3(x +1)

Still have questions? Get your answers by asking now.