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Which absolute value function defines this graph?

OA. f(x) = -4x+21+3
OB. f(x) = 4x + 2) +3
OC. f(x) = -4/x-21-3
OD. f(x) = 4x + 21-3

Which absolute value function defines this graph? OA. f(x) = -4x+21+3 OB. f(x) = 4x-example-1

1 Answer

1 vote

Answer:

A. f(x) = -4|x +2| +3

Explanation:

You want the function that matches the graph of the absolute value function shown. Its vertex is (-2, 3) and it opens downward.

Opens downward

The parent function must be reflected across the x-axis for its graph to open downward. That means the function must be multiplied by a negative number. (Eliminates choices B and D.)

Translated upward

The vertex of the function is translated up 3 units, so 3 will be added to the function value. (Eliminates choices C and D.)

The only remaining viable choice is A.

A. f(x) = -4|x +2| +3

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Additional comment

The translation left 2 units replaces x in the function by (x -(-2)) = (x+2). This matches choice A and eliminates choice C.

g(x) = a·f(x -h) +k

translates f(x) by (h, k). When a < 0, reflects f(x) across the x-axis. Here, (h, k) = (-2, 3).

Which absolute value function defines this graph? OA. f(x) = -4x+21+3 OB. f(x) = 4x-example-1
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User David Poeschl
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