9
practice testMultiple Choice

Practice Test

Question 9 • Mathematics III

Which statement is true about f of x plus 2 is equal to 1 sixth start absolute value x minus 3 end absolute value ?

Answer
A
The graph of f of x has a vertex of open paren negative 3 comma 2 close paren .
B
The graph of f of x opens downward.
C
The graph of f of x is a horizontal compression of the graph of the parent function.
D
The graph of f of x has range of f of x is greater than or equal to negative 2 .

Explanation

Subtract 2 from both sides to get f(x) = (1/6)|x − 3| − 2. The absolute value is smallest when x = 3, so the minimum value of f(x) is −2; its range is therefore f(x) ≥ −2. The graph opens upward and has vertex (3, −2), so the true statement is that its range is greater than or equal to negative 2.

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