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77julia77 [94]
3 years ago
6

What is the focus of the parabola given by `-(1)/(4)(y + 2)^2 = (x −1)`? A. (-1, 2) B. (1, -2) C. (0, -2) D. (0, 2)

Mathematics
2 answers:
katrin [286]3 years ago
5 0

The correct answer is that the focus is, <u><em>(0,−2)</em></u>

Amanda [17]3 years ago
5 0

Answer:

The correct option is C.

Step-by-step explanation:

The given equation is

-\frac{1}{4}(y+2)^2=(x-1)

Multiply both the sides by -4.

(y+2)^2=-4(x-1)            .... (1)

Where, (h,k) is vertex and (h+p,k) is focus.

The standard form of a parabola is

(y-k)^2=4p(x-h)              ..... (2)

From (1) and (2), we get

k=-2,h=1,4p=-4\Rightarrow p=-1

The focus of the parabola is

(h+p,k)=(1-1,-2)=(0,-2)

The focus of the given parabola is (0,-2). Therefore the correct option is C.

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