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Given the functions P(x) = 2x+1 and g(x) = x−5, find the composite functions gp(x), pg(x), pp(x), and gg(x).

Mathematics

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Answers

4 parts
a

2x-4

b

2x-9

c

4x+3

d

x-10

Step-by-step solution

12 steps

Here are the solutions for the functions P(x)=2x+1P(x) = 2x+1 and g(x)=x−5g(x) = x-5.

Part a· 3 steps

Find gp(x)gp(x)

  1. To find gp(x)gp(x), we substitute P(x)P(x) into g(x)g(x).

    gp(x)=g(P(x))=g(2x+1)gp(x) = g(P(x)) = g(2x+1)
  2. Substitute 2x+12x+1 into g(x)=x−5g(x) = x-5.

    g(2x+1)=(2x+1)−5g(2x+1) = (2x+1) - 5
  3. Simplify the expression.

    g(2x+1)=2x−4g(2x+1) = 2x - 4

    The expression for gp(x)gp(x) is 2x−4\boxed{2x-4}.

Part b2x-9

Find pg(x)pg(x)

  1. To find pg(x)pg(x), we substitute g(x)g(x) into P(x)P(x).

    pg(x)=P(g(x))=P(x−5)pg(x) = P(g(x)) = P(x-5)
  2. Substitute x−5x-5 into P(x)=2x+1P(x) = 2x+1.

    P(x−5)=2(x−5)+1P(x-5) = 2(x-5) + 1
  3. Expand and simplify the expression.

    P(x−5)=2x−10+1P(x-5) = 2x - 10 + 1 P(x−5)=2x−9P(x-5) = 2x - 9

    The expression for pg(x)pg(x) is 2x−9\boxed{2x-9}.

Part c4x+3

Find pp(x)pp(x)

  1. To find pp(x)pp(x), we substitute P(x)P(x) into P(x)P(x).

    pp(x)=P(P(x))=P(2x+1)pp(x) = P(P(x)) = P(2x+1)
  2. Substitute 2x+12x+1 into P(x)=2x+1P(x) = 2x+1.

    P(2x+1)=2(2x+1)+1P(2x+1) = 2(2x+1) + 1
  3. Expand and simplify the expression.

    P(2x+1)=4x+2+1P(2x+1) = 4x + 2 + 1 P(2x+1)=4x+3P(2x+1) = 4x + 3

    The expression for pp(x)pp(x) is 4x+3\boxed{4x+3}.

Part dx-10

Find gg(x)gg(x)

  1. To find gg(x)gg(x), we substitute g(x)g(x) into g(x)g(x).

    gg(x)=g(g(x))=g(x−5)gg(x) = g(g(x)) = g(x-5)
  2. Substitute x−5x-5 into g(x)=x−5g(x) = x-5.

    g(x−5)=(x−5)−5g(x-5) = (x-5) - 5
  3. Simplify the expression.

    g(x−5)=x−10g(x-5) = x - 10

    The expression for gg(x)gg(x) is x−10\boxed{x-10}.

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