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Shtirlitz [24]
3 years ago
9

Need 2 more. 50 points! Please show work, Thanks! :)

Mathematics
1 answer:
rjkz [21]3 years ago
3 0

Answer:

1) C

2) C

Step-by-step explanation:

Question 1)

We want a parabola that has the vertex (-8, -7) and also passes through the point (-7, -4).

So, we can use the vertex form. Remember that the vertex form is:

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

Where a is our leading co-efficient and (h, k) is our vertex.

We know that our vertex is (-8, -7). So, substitute this into the equation:

y=a(x-(-8))^2+(-7)

Simplify:

y=a(x+8)^2-7

Now, we need to determine the value of our a. To do so, we can use the point the problem had given us. We know that the graph passes through (-7, -4).

So, when x is -7, y is -4. Substitute -7 for x and -4 for y:

(-4)=a((-7)+8)^2-7

Solve for a. Add within the parentheses:

-4=a(1)^2-7

Square:

-4=a-7

Add 7 to both sides. Therefore, the value of a is:

a=3

So, our entire equation in vertex form is:

y=3(x+8)^2-7

Our answer is C.

Question 2)

We are given a graph and are asked to find the equation of the graph.

Again, let's use the vertex form. From the graph, we can see that the vertex is at (-2, 2). Let's substitute this into our vertex equation:

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

Simplify:

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

Again, we need to find the value of a.

Notice that the graph crosses the point (-1, 5).

So, let's substitute -1 for x and 5 for y. This yields:

5=a((-1)+2)^2+2

Solve for a. Add within the parentheses.

5=a(1)^2+2

Square:

5=a+2

Subtract 2 from both sides. So, the value of a is:

a=3

Therefore, our entire equation is:

y=3(x+2)^2-2

Our answer is C.

And we're done!

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16 squared with explanation.
pochemuha

Answer:

256

Step-by-step explanation:

Multiply 16 by 16.

You bet 256, right?

The answer is 256 now.

Hope it helps!

Formula: multiply number you have x number you have.

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If x+3 is a factor of x^3-x^2-10x+A. What is the value of A?
Leno4ka [110]

Answer:

A = 6.

Step-by-step explanation:

Let a denote a constant (a number, rather than a variable like x.)

Let f(x) denote an expression about x (for example,

By the factor theorem, if (x - a) is a factor of f(x), then f(a) = 0. In other words, if all mentions of x in the expression f(x)\! are replaced with a, then the expression should evaluate to zero.

(x + 3) is equivalent to (x - (-3)). That is: a = -3.

Replace all mentions of x in x^3 - x^2 - 10\, x + A by (-3) to get:

(-3)^3 - (-3)^2 - 10\times (-3) + A.

That should evaluate to zero. Therefore: -27 - 9 + 30 + A = 0. Solve for A to get A = 6.

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3 years ago
Which has the same value as 15 tens
Alex73 [517]
It is 1 and one half.
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The manager of a store wants to have a sales promotion where she gives prizes to the first several people through the door. She
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Doubling the sum of 5 and a number is equal to the same number decreased by 2. what is the equation
SVEN [57.7K]

Answer:

2(x + 5) = x - 2

⟹ x = -12

Step-by-step explanation:

Doubling the sum of 5 and a number is equal to the same number decreased by 2. What is the equation?

This word problem can be written as:

⟹ 2(x + 5) = x - 2

1. Distribute:

2(x) + 2(5) = x - 2

⟹ 2x + 10 = x - 2

2. Subtract x from both sides:

2x - x + 10 = x - x - 2

⟹ x + 10 = -2

3. Subtract 10 from both sides:

x + 10 - 10 = -2 - 10

⟹ x = -12

4. Check your work:

2(x + 5) = x - 2

2(-12 + 5) = -12 - 2

2(-7) = -20

⟹ -14 = -14 ✔

Learn more here:

brainly.com/question/17821973

3 0
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