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MCQ Functions - Functions

The CAT Online Free Test Prep MCQs Functions - Functions

Functions: Functions

Question:

If f(x) = x2 – 5 for all values x and f(a) = 4, what is one possible value of a?
Option A:      14
Option B:      8
Option C:      3
Option D:      1
Option E:      11
  A     B     C     D     E  
Show/Hide Answer and Explanation

Correct Answer: C

Explanation Video

Explanation

Using the defined function, f(a) will produce the same result when substituted for x:

f(a) = a2 – 5

Setting this equal to 4, you can solve for a:

a2 – 5 = 4

a2 = 9

a = –3 or 3
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How to Solve Functions

For Functions question first understand the statement and the question stem. Try to solve and click the corresponding answer option. The drop down will appear to show the correct answer and explanation.