7
QuizMultiple Choice

Quadratic Functions: Standard Form — Quiz

Question 7 • Algebra I

Which statements about the graph of the function f of x is equal to negative x squared minus 4 x plus 2 are true? Choose three correct answers.

Answer
A
The domain is start set x such that x is less than or equal to negative 2 end set .
B
The function is decreasing over the interval negative 4 comma infinity .
C
The range is start set y such that y is less than or equal to 6 end set .
D
The function has a positive y -intercept.
E
The function is increasing over the interval negative infinity comma negative 2 .

Explanation

Rewrite the function as f(x) = −(x + 2)² + 6. Its graph opens downward and has a maximum at (−2, 6), so it increases for x < −2 and decreases for x > −2. Therefore, B is true and the range is y ≤ 6, making D true. The y-intercept is f(0) = 2, which is positive, so E is true.

AI-written and checked against the verified answer.

Previous
Next