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Andre45 [30]
3 years ago
10

HELP ASAP FOR BRAINLIEST:

Mathematics
1 answer:
goldenfox [79]3 years ago
8 0

Answer: y = -14/9(x + 4)^2 + 7

Step-by-step explanation:

The given roots of the quadratic function is (-1, -7)

The vertex is at (-4, 7)

The formula is

y = a(x - h)^2 + k

The vertex is (h, k)

Comparing with the given vertex, (-4, 7), h = -4 and k = 7

Substituting into the formula

y = a(x - h)^2 + k, it becomes

y = a(x - - 4)^2 + 7

y = a(x + 4)^2 + 7

From the roots given (-1, -7)

x = -1 and y = -7

Substituting x = -1 and y = -7 into the equation,

y = a(x + 4)^2 + 7, it becomes

-7 = a(-1+4)^2 + 7

-7 = a(3^2 ) + 7

- 7 = 9a + 7

-7-7 = 9a

9a = -14

a = -14/9

Substituting a = - 14/9 into the equation, it becomes

y = -14/9(x + 4)^2 + 7

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On three examinations, you have grades of 85, 78, and 84. There is still a final examination, which counts as one grade In order
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Step-by-step explanation:

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Where x is the grade obtained in the final examination and av is the final average. To obtain an A, av has to be at least 90, av≥90, and to obtain an B, av has to be at least 80, av≥80

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So, if we get 100 on the final average:

x = 100,

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<em>Answer: No, the higher grade obtained would be 86,75.</em>

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<em>Answer: I must have a 73 or MORE to earn a B in the course</em>

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