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20 March, 09:50

Given f (x) = 5x-1 What is f (-2)

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Answers (2)
  1. 20 March, 11:19
    0
    -11

    Step-by-step explanation:

    Start off with the meaning of f (x) = 5x - 1

    The notation is used to tell us that when a number is put in for the x on the left, it is put in every x on the right as well. The left x comes first then what to do with it on the right gives the answer. So watch it happen.

    f (-2) means that wherever you see an x on the right, put in - 2 for it.

    f (-2) = 5*-2 - 1

    f (-2) = - 10 - 1

    f (-2) = - 11

    No matter how complicated what is on the right, the rule is the same.

    f (x) = x^5 - 4x^3 - x

    f (-2) = (-2) ^5 - 4 * (-2) ^3 - 2 would be how you interpret that question.

    f (-2) = - 32 + 32 - 2

    f (-2) = - 2
  2. 20 March, 13:01
    0
    f (2) means multiply it by 5 and then subtract 1.

    --> f (x) = 5x-1

    --> f (-2) = 5 (-2) - 1

    --> f (2-) = - 10-1

    --> f (-2) = - 11
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