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olga55 [171]
4 years ago
13

What is x^2+8x-5 in vertex form? Please explain.

Mathematics
2 answers:
faust18 [17]4 years ago
5 0
x^2+8x-5=\\
x^2+2\cdot4\cdot x-5=\\
x^2+2\cdot4\cdot x+4^2-4^2-5=\\
(x+4)^2-16-5=\\
(x+4)^2-21

lina2011 [118]4 years ago
5 0
<span>x^2+8x-5=\\ x^2-8x+16-21=\\ (x-4)^2-21</span>
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A circle has an area of approximately 615 square millimeters. What is the diameter of the circle
noname [10]

Answer:

When using the given information, the diameter of the circle is going to be 28 mL.

Step-by-step explanation:

First, we need to know the formula for finding the area of a circle.

Area=r^2\pi

Now, we need to rearrange the formula so we can find the radius.

Radius=\sqrt{\frac{A}{\pi} }

Next, we plug in the given area into the equation.

Radius=\sqrt{\frac{615}{\pi}}

Radius=\sqrt{196}

Radius=14

Now that we have the radius, we can find the diameter. The radius is half the length of the diameter. So, in order to find the diameter, we have to multiply the radius by 2.

14 * 2=28

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4 years ago
Which statement is true about the circumference of a circle? The circumference is equal to the radius of the circle. The circumf
MaRussiya [10]

Answer:

The circumference is found by multiplying Pi by the diameter is the true statement. All the others are lies! :)

8 0
3 years ago
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I need help.<br><br> someone help please!
Vikentia [17]
Sorry, I think there is missing context?
4 0
3 years ago
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Jo's mother, Anne, is four times as old as Jo. In four years time, Anne will be three times as old as Jo. How old is Jo? (this i
pentagon [3]

Answer:

Jo's age = x = 8 years

Step-by-step explanation:

Let

Jo's age = x

Jo's mother, Anne's age = 4x

In four years time, Anne will be three times as old as Jo.

Jo's age =3( x + 4)

Jo's mother, Anne's age = 4x + 4

How old is Jo?

Equate Jo's age and his mother's age

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3x - 4x = 4 - 12

-x = - 8

Divide both sides by -1

x = 8

Therefore,

Jo's age = x = 8 years

8 0
3 years ago
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NNADVOKAT [17]
The answer is 44

To find this answer, we replace x with 8 and use PEMDAS (order of operations) to simplify

f(x) = 6*x - 4
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f(8) = 44

4 0
4 years ago
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