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Travka [436]
3 years ago
10

Anyone able to help?

Mathematics
1 answer:
Alona [7]3 years ago
4 0

Your teacher didn't pick the most simple way to do this problem, the steps your teacher gave is confusing. Using the same concept, I am going to do this my way then I will show a different method.

3x^2+24x+9=0

x^2+8x+3=0

x^2+8x+16+3=16

(x+4)^2=13

x+4=±\sqrt13

x=-4±\sqrt13

This is how you are suppose to solve it with completing the square and all the steps, to fill your teacher's blank you will have to go from my answer to how your teacher want you to write it.

*Now I am going to show you a way to solve this with the quadratic formula.

I am going to use the main formula because its more clear although the even formula is easier for this question.

3x^2+24x+9=0

x=(-24±\sqrt{24^2-4*3*9})/2*3

x=(-24±\sqrt{576-108})/6

x=(-24±\sqrt{468})/6

since 468 is a multiple of 36

x=(-24±6\sqrt{13)/6

x=-4±\sqrt{13}

This bottom way is really good if you can calculate quickly, with a lot of practice this way is much better for solving quadratic equations that cannot be factored.

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The length of a rectangular is 2/5 meter.It's width is 1/4 of its length .What is the perimeter of the rectangle?
Varvara68 [4.7K]
I think the answer is 2 13/20
Or, in decimals:             1.3
3 0
3 years ago
Brice needs 2 feet of ribbon to tie a bow around a birthday present. He has has 3 feet of ribbon. Is that enough?
maks197457 [2]
Hello,

Here is your answer:

The proper answer to this question is "Yes"!

Here's why:

Brice needs TWO FEET for the present:

He has THREE FEET of ribbon:

3-2=1

Which means Brice should have one feet of ribbon left over!

Your answer is Yes!

If you need anymore help feel free to ask me!

Hope this helps!

7 0
4 years ago
Stacy wrote a number. In the number, the value of the 4 is 10 times the value of
Nikitich [7]
400
The 4 in 1745 is in the 10’s place
so that means the 4 is 40
If the value of the 4 is time times greater that means it would be 400
I’m guessing?
5 0
4 years ago
3 more and im done HELPPP :(
kotykmax [81]

Answer:

<h2>x = 5</h2>

Step-by-step explanation:

f(5) =  \sqrt{5 - 5}  + 2

f(5) =  \sqrt{0}  + 2

f(5) = 2

8 0
3 years ago
Which facts could be applied to simplify this expression? Check all that apply. (-5x-3y)-(-x-3z).
Mademuasel [1]

Answer:

The correct options are 1, 2, 4 and 6.

Step-by-step explanation:

The given expression is

(-5x-3y)-(-x-3z)

To subtract like term subtract like terms, subtract the coefficients, not the variables.

Therefore option 1 is correct.

Like terms are terms that contain the same variable, raised to the same power. For example: 3xy and 5xy, 4x² and 3x².

Therefore, option 2 is correct.

Using distributive property we get

-5x-3y-(-x)-(-3z)

-5x-3y+x+3z

Only combine terms which contain the same variable.

Therefore option 4 is correct.

(-5x+x)-3y+3z

-4x-3y+3z

The simplified expression is -4x-3y+3z. Therefore option 6 is correct.

3 0
3 years ago
Read 2 more answers
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