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Tanya [424]
3 years ago
11

Find a parabola with equation y=ax^2+bx+c that has a slope 10 at x=1, slope -26 at x=-1, and passes through the point (2,29)

Mathematics
1 answer:
Hatshy [7]3 years ago
6 0

9514 1404 393

Answer:

  y = 9x^2 -8x +9

Step-by-step explanation:

The given equation has derivative ...

  y' = 2ax +b

The requirements on slope give rise to two equations:

  2a(1) +b = 10

  2a(-1) +b = -26

Adding these equations together gives ...

  2b = -16   ⇒   b = -8

Then we have ...

  2a -8 = 10

  a = (10 +8)/2 = 9

__

The given point lets us find the constant term c.

  y = 9x^2 -8x +c

  c = y -(9x -8)x = 29 -(9(2) -8)(2) = 29 -20 = 9

The equation of the parabola is ...

  y = 9x^2 -8x +9

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Solve for x write the smaller solution first and the larger solution second. Round to two decimal places (x+8)^2-7=0
siniylev [52]

Answer:

x ≈ - 10.65, x ≈ - 5.35

Step-by-step explanation:

Given

(x + 8)² - 7 = 0 ( add 7 to both sides )

(x + 8)² = 7 ( take the square root of both sides )

x + 8 = ± \sqrt{7} ( subtract 8 from both sides )

x = - 8 ± \sqrt{7} , thus

x = - 8 - \sqrt{7} ≈ - 10.65

x = - 8 + \sqrt{7} ≈ - 5.35

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3 years ago
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3 years ago
The currency in switzerland is called a franc. On a certain day, one U.S. dollar equaled 1 1/4 swiss france. Write and solve a m
Rufina [12.5K]

Answer:

<u>The equation is x = y * 4/5  and US$ 12 would equal 15 Swiss Francs</u>

Step-by-step explanation:

<u>1. Let's review all the information provided for solving this question:</u>

1 US$ equivalent to 1 1/4  Swiss Franc

2. Let's write and solve a multiplication equation to find the amount  of US$ that would equal 15 Swiss Francs

x = Amount of US$ equivalent

y = Amount of Swiss Francs

x = y /1.25

x = y / 5/4 (1.25 = 5/4)

<u>x = y * 4/5</u>

Now, let's replace with the real values:

x = 15 * 4/5

x = 60/5

<u>x = 12</u>

<u>US$ 12 would equal 15 Swiss Francs</u>

6 0
3 years ago
Name
Sedaia [141]

Answer:

Step-by-step explanation:

19% of 72 = about 14%

42% of 16 = about 7%

47% of 118 = about 55%

67% of 296 = about 198%

7 0
3 years ago
Simplify the following expression! Please
Alex Ar [27]
2(-20)+3[5/4(-20)]

-40 + 3[-25]
-40 + -75
-115

-115 is your final answer.
6 0
3 years ago
Read 2 more answers
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