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2 years ago

Help me!!!! I don’t understand the equation

Mathematics

1 answer:

chubhunter [2.5K]2 years ago

3 0

Step-by-step explanation:

it does not matter, if you understand the equation itself. look at the graph ! what is the curve doing ?

I don't know the options of the pull-down menus, so I will give you my best guesses based on the facts :

the domain of a function is the set or interval of all valid x (or input) values.

the range of a function is the set of interval of all valid y (or functional result) values.

so, clearly, x is in the interval (-infinity, +infinity). which is therefore the domain.

please conduct the round brackets. they indicate that the specified interval limits are not included (as infinity is not a value, only a concept, and can never be reached).

and y is in the interval of (0, +infinity). which is therefore the range.

we have to use the round brackets also for 0, as the function will never deliver the value 0, but its tendency or limit goes there (but again, only in infinity, which will never be reached).

the function continuously decreases when x increases.

again, I am not sure what the options are here, and what your teacher wants to "hear".

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In what step did he make an error?

Ilya [14]

Answer:

step 4

Step-by-step explanation:

because y is equation 2 is -y so the sign should have changed for -2x it should have been +2x since - and - equals to +

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3 years ago

Read 2 more answers

Is 7500000 meters greater than 750 kilometers

monitta

A kilometer is 1000 meters.
1000 time 750 equals 750000
So the answer is yes, 7500000 is greater than 750000

5 0

4 years ago

(2+3i)+(-4+i) left-parenthesis 2 plus 3 i right-parenthesis plus left-parenthesis negative 4 plus i right-parenthesis

Triss [41]

Answer:

-2 + 4i

Step-by-step explanation:

1) remove unnecessary parentheses:

2 + 3i + (-4 + i)

2) calculate difference:

-4 + 2 = -2

-2 + 3i + i

3) collect like terms:

For our answer: -2 + 4i

There ya go, hope I helped good luck!

4 0

3 years ago

Cuál es la solución de la ecuación 9 x + 1 = 2x + 15

arsen [322]

Answer:

X=2

Step-by-step explanation:

9x+1=2x+15

1. restar 1 de ambos lados ejemplo: 9x+1-1=2x+15-1

2. simplificar Ejemplo: 9x=2x+14

3. restar 2x de ambos lados ejemplo: 9x-2x=2x-2x+14

4. simplificar ejemplo: 7x=14

5.divide ambos lados entre 7 ejemplo: 7x/7= 14/7

6.Simplificar ejemplo: x=2

3 0

3 years ago

Which statements are true about the graph of the function f(x) = x2 – 8x + 5? Check all that apply.

statuscvo [17]

Answer:

A, D, E are true

Step-by-step explanation:

You have to complete the square to prove A. Do this by first setting the function equal to 0, then moving the 5 to the other side.

$x^2-8x=-5$

Now we can complete the square. Take half the linear term, square it, and add it to both sides. Our linear term is 8 (from the -8x). Half of 8 is 4, and 4 squared is 16. So we add 16 to both sides.

$(x^2-8x+16)=-5+16$

We will do the addition on the right, no big deal. On the left, however, what we have done in the process of completing the square is to create a perfect square binomial, which gives us the h coordinate of the vertex. We will rewrite with that perfect square on the left and the addition done on the right,

$(x-4)^2=11$

Now we will move the 11 back over, which gives us the k coordinate of the vertex.

$(x-4)^2-11=y$

From this you can see that A is correct.

Also we can see that the vertex of this parabola is (4, -11), which is why B is NOT correct.

The axis of symmetry is also found in the h value. This is, by definition, a positive x-squared parabola (opens upwards), so its axis of symmetry will be an "x = " equation. In the case of this type of parabola, that "x = " will always be equal to the h value. So the axis of symmetry is

x = 4, which is why C is NOT correct, either.

We can find the y-intercept of the function by going back to the standard form of the parabola (NOT the vertex form we found by completing the square) and sub in a 0 for x. When we do that, and then solve for y, we find that when x = 0, y = 5. So the y-intercept is (0, 5).

From this you can see that D is also correct.

To determine if the parabola has real solutions (meaning it will go through the x-axis twice), you can plug it into the quadratic formula to find these values of x. I just plugged the formula into my graphing calculator and graphed it to see that it did, indeed, go through the x-axis twice. Just so you know, the values of x where the function go through are (.6833752, 0) and (7.3166248, 0). That's why you need the quadratic formula to find these values.

7 0

4 years ago