Mathematics
Grade10
Easy

Question

A piecewise-defined function is shown.
straight f left parenthesis straight x right parenthesis equals open curly brackets table attributes columnalign right columnspacing 1em end attributes row cell straight x minus 1 comma straight x less than straight n end cell row cell negative straight x plus 4 comma straight x greater or equal than straight n end cell end table close
select the correct option mentioned below.
Statement 1: If the value of n changes, then the range of the function also changes.
Statement 2: If the value of n = 4, then the range is f(x) ≤ 2.

  1. Only statement 1 is correct
  2. Only statement 2 is correct
  3. Both statement 1 & statement 2 are correct 
  4. Both statement 1 & statement 2 are wrong

hintHint:

We check for each statement whether they are correct or not. To check, we simply put in different values of n and calculate the values of f(x)'s to find the corresponding range. Then, finally, we conclude our findings to prove whether the statements are correct or not.

The correct answer is: Only statement 1 is correct


    Step 1 of 2:
    First, we check the statement 2 is correct or not.
    Say, if n = 4.
    f(1) = x – 1 = 1 – 1 = 0; f(2) = x – 1 = 2 – 1 = 1; f(3) = x – 1 = 3 – 1 = 2; f(4) = -x + 4 = -4 + 4 = 0; f(5) = -x + 4 = -5 + 4 = -1; f(6) = -x + 4 = -6 + 4 = -2 etc.
    So, here the range is f(x) ≤ 2. Hence, statement 2 is correct.
    Step 2 of 2:
    If n = 7, then
    f(1) = x - 1 = 1 - 1 = 0; f(2) = x - 1 = 2 - 1 = 1; f(3) = x - 1 = 3 - 1 = 2; f(4) = x - 1 = 4 - 1 = 3; f(5) = x - 1 = 5 - 1 = 4; f(6) = x - 1 = 6 - 1 = 5; f(7) = -x + 4 = -7 + 4 = -3; f(8) = -x + 4 = -8 + 4 = -4 etc.
    So, here the range is f(x) ≤ 5.
    That means changing the value of n changes the range. Hence, statement 1 is correct.
    Final Answer:
    The right choice is- c. Both statement 1 & statement 2 are correct.

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