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anonymous

  • one year ago

Herlp Mer Irn Marth!!!

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  1. anonymous
    • one year ago
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    Use the functions f(x) = 5x − 12 and g(x) = 11x + 2 to complete the function operations listed below. Part A: Find (f + g)(x). Show your work. (3 points) Part B: Find (f ⋅ g)(x). Show your work. (3 points) Part C: Find f[g(x)]. Show your work. (4 points)

  2. anonymous
    • one year ago
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    @emmigrace222 @welshfella @Wxlfz @campbell_st @mathstudent55 @Michele_Laino

  3. welshfella
    • one year ago
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    A just add 5x - 12 and 11x + 2

  4. welshfella
    • one year ago
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    B 5x - 12 - (11x + 2) be careful of the signs when you deal with the parentheses

  5. anonymous
    • one year ago
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    Part A: (f + g)(x) = 16x - 10 Add x Terms: (f + g)(x) = 11x + 5x = 16x Add Regular Terms: (f + g)(x) = -12 + 2 = 10 Solution: (f + g)(x) = 16x - 10

  6. anonymous
    • one year ago
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    So, part b I just multiply them? @campbell_st ?

  7. anonymous
    • one year ago
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    Part A: (f * g)(x) = 16x - 10 Multiply x Terms: (f * g)(x) = 11x * 5x = 55x Multiply Regular Terms: (f * g)(x) = -12 * 2 = 24 Solution: (f + g)(x) = 55x - 24

  8. anonymous
    • one year ago
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    What is C then @welshfella ?

  9. welshfella
    • one year ago
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    your first post where you worked out f + g was correct A is 16x - 10

  10. welshfella
    • one year ago
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    Oh part B is multiplying Sorry i misread the question

  11. anonymous
    • one year ago
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    Ok, cool. So, what is Part C?

  12. welshfella
    • one year ago
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    (f ⋅ g)(x) = (5x -12)(11x + 2) = 5x(11x + 2) - 12(11x + 2) = 55x^2 + 10x - 132x - 24 = 55x^2 - 122x - 24

  13. welshfella
    • one year ago
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    C you replace the x in f(x) by g(x) then simplify |dw:1438287486460:dw|

  14. welshfella
    • one year ago
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    f(g(x)) = 5 (11x + 2) - 12 simplify

  15. anonymous
    • one year ago
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    Part C: f[g(x)] = 55x^2 - 122x - 24 Group Into Two: f[g(x)] = (5x -12)(11x + 2) = Replace f(x) and g(x): f[g(x)] = 5x(11x + 2) - 12(11x + 2) Simplify: f[g(x)] = 55x^2 + 10x - 132x - 24 Solution: f[g(x)] = 55x^2 - 122x - 24

  16. anonymous
    • one year ago
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    @welshfella

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