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If f(x) = x/2 – 1, what is the value of f(f(10))?

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Bunuel
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If f(x) = x/2 – 1, what is the value of f(f(10))? [#permalink] New post   13 Dec 2018, 01:40
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A
B
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E

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89% (00:25) correct 11% (00:27) wrong based on 64 sessions
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If \(f(x) = \frac{x}{2}– 1\), what is the value of \(f(f(10))\)?

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B. 1
C. 2
D. 3
E. 4
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Re: If f(x) = x/2 – 1, what is the value of f(f(10))? [#permalink] New post   13 Dec 2018, 01:56
\(f(x) = \frac{x}{2}– 1\)
\(f(10) = \frac{10}{2}– 1\)
\(f(10) = 4\)

\(f(f(10)) = f(4) = \frac{4}{2}– 1\)
\(f(4) = 1\)

Hence Option )B) is our bet.

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Gladi

Bunuel wrote:
If \(f(x) = \frac{x}{2}– 1\), what is the value of \(f(f(10))\)?

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E. 4
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If f(x) = x/2 – 1, what is the value of f(f(10))? [#permalink] New post   13 Dec 2018, 04:49
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Solution


Given:
    • f(x) = \(\frac{x}{2} - 1\)

To find:
    • The value of f(f(10))

Approach and Working:
    • f(10) = \(\frac{10}{2} – 1 = 4\)
    • f(f(10)) = f(4) =\(\frac{4}{2} – 1 = 1\)

Hence, the correct answer is Option B

Answer: B

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Re: If f(x) = x/2 1, what is the value of f(f(10))? [#permalink] New post   31 Oct 2022, 23:10
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Given that \(f(x) = \frac{x}{2}– 1\) and we need to find the value of \(f(f(10))\)?

To find f(10) we need to compare what is inside ( ) in f(10) and f(x)

=> We need to substitute x with 10 in \(f(x) = \frac{x}{2}– 1\) to get the value of f(10)

=> \(f(10) = \frac{10}{2}– 1\) = 5 - 1 = 4

=> f(f(10)) = f(4) = \(\frac{4}{2}– 1\) = 2 - 1 = 1

So, Answer will be B
Hope it helps!

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Re: If f(x) = x/2 1, what is the value of f(f(10))? [#permalink]
31 Oct 2022, 23:10
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