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grandymaker [24]
3 years ago
14

The focus of a parabola is located at (4,0), and the directrix is located at x =-4. Which equation represents the parabola?

Mathematics
1 answer:
Liono4ka [1.6K]3 years ago
6 0

Answer:

Step-by-step explanation:

One of the important things to remember about parabolas is that the vertex is directly in between the focus and the directrix. Our focus is at (4, 0) and the directrix is at (-4, 0), so that means that the vertex (h, k) is at the origin (0, 0). Another important thing to remember is that the distance between either the vertex and the focus or the vertex and the directrix is the p value, the value that tells us how stretched or compressed the parabola is. Another thing to remember is that a parabola will always wrap itself around the focus away from the directrix. So here's what we know then:

Our parabola opens to the right, the equation for that is

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

p = 4, and the vertex is (0, 0). Filling in the formula for the parabola using that info:

(y-0)^2=4(4)(x-0) which simplifies a bit to

y^2=16x and solving it for x:

\frac{1}{16}y^2=x

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Alex_Xolod [135]
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For B) start at 5 on y lines, and remember -x is same thing is -1. And negative means go down! So move 1 down and 1 to the right and make point then move 1 down and make 1 right and make second points and continue. Draw a lines.

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3 0
3 years ago
I have no idea!!! Help??
Savatey [412]

Answer:

x<5

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Step-by-step explanation:

7x -19 < 16

Add 19 to each side

7x -19 +19< 16+19

7x< 35

Divide by 7

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3 0
3 years ago
4. (4-7)2 -<br> 6.7 +20
LuckyWell [14K]

Answer: 7.3

Step-by-step explanation:

Do the parentheses first!

4-7= -3

Then, multiply -3 by 2

-3×2= -6

Next,

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Then, add -12.7 to 20

-12.7+20=7.3

Your answer is 7.3

4 0
2 years ago
I need help right away ASAP!!!Please help me please finding the missing angle
german

\\ \sf\longmapsto tan\Theta=\dfrac{P}{B}

\\ \sf\longmapsto tan40=\dfrac{48}{x}

\\ \sf\longmapsto 0.8=\dfrac{48}{x}

\\ \sf\longmapsto 0.8x=48

\\ \sf\longmapsto x=\dfrac{48}{0.8}

\\ \sf\longmapsto x=60

8 0
2 years ago
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