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October 8th, 2016, 10:31 PM   #1
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Unhappy Function Question

A function f is defined by

f(x) = 3 -2x, for all real values of x, -1<x<=5

Question:

- Find the element that is halved under f.

Appreciate if you can help
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October 8th, 2016, 10:49 PM   #2
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Quote:
Originally Posted by Mathtan View Post
A function f is defined by

f(x) = 3 -2x, for all real values of x, -1<x<=5

Question:

- Find the element that is halved under f.

Appreciate if you can help
$f(x) = \dfrac x 2$

$3 - 2x = \dfrac x 2$

$6 - 4x = x$

$6 = 5x$

$x = \dfrac 6 5$
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October 9th, 2016, 02:20 AM   #3
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What is the meaning of halved under f?
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October 9th, 2016, 02:21 AM   #4
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Thanks for your reply @romsek
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October 9th, 2016, 03:47 AM   #5
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Your formal answer should also point out that x = 6/5 satisfies -1 < x $\small\leqslant$ 5.
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