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bogdanovich [222]
3 years ago
6

Identify the parent function that can be used to graph the function f(x)=-9(x+5)^2

Mathematics
1 answer:
svetoff [14.1K]3 years ago
8 0

Answer:

Option a) f(x)=x^2

Step-by-step explanation:

The parent function that can be used to graph the function f(x)=-9(x+5)^2 is f(x)=x^2

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Answer:

y = 1/12 (x − 5)²

Step-by-step explanation:

We can solve this graphically without doing calculations.

The y component of the focus is y = 3.  Since this is above the directrix, we know this is an upward facing parabola, so it must have a positive coefficient.  That narrows the possible answers to A and C.

The x component of the focus is x = 5.  Since this is above the vertex, we know the x component of the vertex is also x = 5.

So the answer is A. y = 1/12 (x−5)².

But let's say this wasn't a multiple choice question and we needed to do calculations.  The equation of a parabola is:

y = 1/(4p) (x − h)² + k

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The vertex is halfway between the focus and the directrix.  So p is half the difference of the y components:

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h = 5

So:

y = 1/(4×3) (x − 5)² + 0

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