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vladimir2022 [97]
3 years ago
15

Solve the quadratic function by completing the square 2x^2+8x+14=0

Mathematics
1 answer:
Dmitry [639]3 years ago
7 0

2x^2+8x+14=0 \\\\x^2+4x+7=0\\\\x^2+4x+4+3=0\\\\(x+2)^2=-3\\\\x+2=\sqrt{-3} \vee x+2=-\sqrt{-3}\\\\x=-2+\sqrt3i \vee x=-2-\sqrt3 i

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Wittaler [7]

A) -28. 47° latitude and 7.35° longitude

8 0
3 years ago
Find the equation of the directrix of the parabola found in part A.
elena-s [515]

The specific equation of the parabola can be found by plugging the given

values of the variables of the general equation.

<h3>Correct Response;</h3>
  • \displaystyle The \ equation \ of \ the \ parabolic \ reflector \ is; \ \underline{ y = \frac{1}{12} \cdot x^2}
<h3>Method used to obtain the above equation;</h3><h3 /><h3>Given parameters;</h3>

The vertex of the parabola is at the origin with coordinates (0, 0)

The location of the focus = 3 cm from the vertex

<h3>Required:</h3>

The equation that models the parabola.

<h3>Solution:</h3>

The vertex form of the equation of a parabola is y = a·(x - h)² + k

The above equation can be expressed as (x - h)² = 4·p·(y - k)

Where in a vertical parabola;

(h + p, k) = The coordinates of the focus

(h, k) = The coordinates of the vertex = (0, 0)

p = 3 = The distance of the focus from the vertex

Therefore, the coordinates of the focus = (0 + 3, 0) = (3, 0)

The equation of the parabola is therefore;

(x - 0)² = 4×3 × (y - 0) = 12·y

x² = 12·y

  • \displaystyle The \ equation \ of \ the \ parabola \ that \ models \ the \ reflector \ is; \ \underline{ y = \frac{1}{12} \cdot x^2}

Learn more about the equation of a parabola here:

brainly.com/question/2131669

5 0
3 years ago
Which of the following is not an example of a perfect square?<br> a. 9<br> b. 200<br> c. 4<br> d. 64
timurjin [86]

The answer is nine .nine is not a perfect square.

8 0
4 years ago
Read 2 more answers
Jay works as a waiter at a restaurant.
ryzh [129]

Answer:

67.33.

Step-by-step explanation:

To figure out the tip, you need to find 20% of $52.60.

0.2×52.6=10.52

You should leave $10.52 for the waiter if you want to leave him exactly 20%.

To figure the tax, you need to find 8% of $52.60.

0.08×52.6=4.208

Next, add them up:

52.6+10.52+4.208=67.328

The total bill, including tax and tip, will be $67.33.

7 0
2 years ago
Solve. <br> 1/2x - 2/5x = -2
Makovka662 [10]
1/2x - 2/5x = -2

1/10x = -2

x = -20
3 0
3 years ago
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