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MariettaO [177]
2 years ago
8

Find the equation of the axis of symmetry for the parabola y = x2 + 6x + 9

Mathematics
1 answer:
Jobisdone [24]2 years ago
4 0

Answer: x = - 3

Step-by-step explanation:

The equation is in a standard form of equation as;

y = ax^2 + bx + c, and therefore, the axis of symmetry is given by the formula,

X = - b / 2a.

Therefore using that in the question, a = 1 and b= 6

Therefore, the axis of symmetry is:

x = - (6) / 2(1) which gives

x = - 3

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if the sphere has a diameter of 5, then its radius is half that, or 2.5.

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3 years ago
In a class test of 15 questions, (+4) marks are given for every correct answer, (– 2) marks are
romanna [79]

If he answered 3 questions correctly, then the number of questions is got wrong is 7 and the number of questions that he did not attempt is 5.

<h3>What is the linear system?</h3>

A linear system is one in which the parameter in the equation has a degree of one. It might have one, two, or even more variables.

In a class test of 15 questions, (+4) marks are given for every correct answer, (– 2) marks are given for every incorrect answer, and 0 marks are given for questions that are not attempted. Punit scored (– 2) marks.

If he answered 3 questions correctly, then the number of the question are got wrong and the number of the question that he did not attempt.

Let x be the correct question and y be the incorrect question, z be the number of questions that he did not attempt, and A be the number of the total score. Then we have

4x – 2z = A

x + y + z = 15

If A = -2 and x = 3, then we have

4 × 3 – 2z = -2

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Then the value of y will be

3 + y + 7 = 15

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More about the linear system link is given below.

brainly.com/question/20379472

#SPJ1

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