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Kipish [7]
3 years ago
7

Factorise the following using the Difference of Two Squares or Perfect Squares rule: a) (2x-2)^2 - (x+4)^2 b) (3x+4) (3x-4)

Mathematics
1 answer:
emmainna [20.7K]3 years ago
7 0

Answer:

Step-by-step explanation:

Hello, please consider the following.

a)

(2x-2)^2 - (x+4)^2 \\\\=(2x-2-(x+4))(2x-2+x+4)\\\\=(2x-2-x-4)(3x+2)\\\\=\boxed{(x-6)(3x+2)}

b)

(3x+4) (3x-4)\\\\=(3x)^2-4^2\\\\=\boxed{9x^2-16}

Thank you.

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Kharon needs to write 3 book reports with b pages and 3 science reports with s pages during the school year. Write an algebraic
aalyn [17]

Answer:

3b+3s

Step-by-step explanation:

According to the statement, Kharon needs to write 3 book reports with b pages. This means that he has 3 books and each of them has b amount of pages which you can express as b+b+b that is equal to 3b. Also, he has 3 science reports with s pages which is 3s. In order to find the total number of pages, you have to add up 3b plus 3s. According to this, the algebraic expression for the total number of pages Kharon will need to write is: 3b+3s.

4 0
3 years ago
To determine the density of grains, a student uses a 50ml beaker graded by 5ml increments and a scale with 1g absolute uncertain
labwork [276]

Answer:

The mass of the grains = 120 ± 1 g

Step-by-step explanation:

we are given the following:

Total mass of container + grains = 185 grams

Mass of container = 65 grams

Therefore, mass of grains is calculated as follows:

Mass of grains = ( Mass of container + grains) - mass of container

= 185 - 65 = 120 grams.

since the scale has an absolute uncertainty of 1 g, the mass of the grains is written as 120 ± 1 g

8 0
4 years ago
Hello! Can you help you can get more points! Click on the photo for more view etc.
Murrr4er [49]

Answer:

22,950

Step-by-step explanation:

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4 0
3 years ago
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Alchen [17]
F(x) = x + 1
          ------
            b

g(x) = cx - d


flip values of x and y in each equation, then solve for y:


x = y + a
      -------
         b

y = a - bx


``````````````````````````````````````````````````````````

x = cy - d

y = x + d
      -------
         c
3 0
3 years ago
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Jared uses 24 tiles to cover the top of his desk.of the 24 tiles,3/4 are blue. How many of the tiles are blue
rewona [7]
We multiply the fraction of 3/4 to the whole number 24 to get the equivalent number of the fraction.

24 * 3/4 = (24 * 3)/4 = 72/4 = 18

3/4 of 24 is 18.

There are 18 blue tiles out of the 24 tiles used.
5 0
3 years ago
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