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27 June, 06:17

Which function has an inverse that is a function?

1. b (x) = x2 + 3

2. d (x) = - 9

3. m (x) = - 7x

4. p (x) = |x|

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Answers (1)
  1. 27 June, 06:46
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    1. y = x^2 + 3

    x = y^2 + 3

    x - 3 = y^2

    y = + or - √ (x-3) not a fction

    2. y = 0x - 9

    x = 0y - 9

    x = - 9 not a fction

    3. y = - 7x

    x = - 7 y

    y = - x/7 yes function

    4. y = |x|

    x = |y|

    y = x,-x not a function
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