Mathematics
Grade10
Easy

Question

Express the function as a piecewise-defined function.
f(x) = 5IxI

  1. f(x) : {(5x, x ≥ 0) , (-5x , x < 0)}
  2. f(x) : {(straight x over 5 , x ≥ 0) , (-straight x over 5 , x < 0)}
  3. f(x) : {(-5x , x ≥ 0) , (5x , x < 0)}
  4. f(x) : {(x , x ≥ 0) , (-x , x < 0)}

hintHint:

A piecewise-defined function is one that is defined not by a single equation, but by two or more. Each equation is valid for some interval.
We simply check the values of f(x) for different values of x and find out the corresponding piecewise-defined function f using function notation.

The correct answer is: f(x) : {(5x, x ≥ 0) , (-5x , x < 0)}


    Step 1 of 1:
    For x = -2, f(x) = 5|-2| = 10
    For x = -1, f(x) = 5|-1| = 5
    For x = 0, f(x) = 0
    For x = 1, f(x) = 5
    For x = 2, f(x) = 10
    Hence, we have f(x) : {(5x, x ≥ 0), (-5x, x < 0)}
    Final Answer:
    The right choice is- d. f(x) : {(5x, x ≥ 0) , (-5x , x < 0)}

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