8
practice testMultiple Choice

Practice Test

Question 8 • Algebra I

Which statements are true about the graph of the function h of x is equal to negative 5 x squared plus 60 x minus 200 ? Choose three correct answers.

Answer
A
The graph of h of x will not intersect the graph of the parent function, f of x is equal to x squared .
B
The value of k , when the equation is written in vertex form, is negative 200 .
C
The parabola has a maximum.
D
The axis of symmetry is the line x is equal to negative 6 .
E
The vertex of the graph is at 6 comma negative 20 .

Explanation

Set the function equal to the parent function: -5x² + 60x - 200 = x². This gives 3x² - 30x + 100 = 0, whose discriminant is (-30)² - 4(3)(100) = -300, so the graphs do not intersect; statement A is true. The vertex occurs at x = -60/(2·-5) = 6, and h(6) = -20, so the vertex is (6, -20) and statement E is true. Since the parabola opens downward, it has a maximum, making statement C true.

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