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sergij07 [2.7K]
3 years ago
14

Which will result in a difference of squares?

Mathematics
2 answers:
Firlakuza [10]3 years ago
4 0

Answer:

The correct option is 3.

Step-by-step explanation:

The difference of squares is defined as

a^2-b^2=(a-b)(a+b)

In option 1,

(-7x+4)(-7x+4)=(-7x+4)^2

This expression is a perfect square, therefore this is not the difference of squares. Option 1 is incorrect.

In option 2,

(-7x+4)(4-7x)=(-7x+4)(-7x+4)=(-7x+4)^2

This expression is a perfect square, therefore this is not the difference of squares. Option 2 is incorrect.

In option 3,

(-7x+4)(-7x-4)=(-7x)^2-(4)^2

This expression is the difference of squares., therefore Option 3 is correct.

In option 4,

(-7x+4)(7x-4)=-(-7x+4)(-7x+4)=-(-7x+4)^2

This expression is a perfect square, therefore this is not the difference of squares. Option 4 is incorrect.

Cerrena [4.2K]3 years ago
3 0

Answer:

C

Step-by-step explanation:

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When adding and subtracting numbers in Scientific Notation, the powers of the base 10 must be the same exponent so that you have
Butoxors [25]

Answer:

The answer is true!

Step-by-step explanation

8 0
1 year ago
an open rectangular cardboard box with a square base is to have a volume of 256cm^3. Find the dimensions of the box if the area
Anit [1.1K]
Let
x------> the length side of the square base of the box
y-------> the height of the box

we know that
volume of the box=b²*h
b=x
h=y
volume=256 cm³
so
256=x²*y------>y=256/x²-------->  equation 1

<span>The amount of material used is directly proportional to the surface area, so we will minimize the amount of material by minimizing the surface area.</span>

surface area of the cardboard=area of the base+perimeter of base*height
area of the base=x²
perimeter of the base=4*x
height=y
surface area=x²+4x*y-----> equation 2
substitute equation 1 in equation 2
SA=x²+4x*[256/x²]-----> SA=x²+1024/x

step 1 
find the first derivative of SA and equate to zero
2x+1024*(-1)/x²=0------> 2x=1024/x²----> x³=512--------> x=8 cm
y=256/x²------> y=256/8²-----> y=4 cm

the answer is
the length side of the square base of the box is 8 cm
the height of the box is 4 cm

5 0
3 years ago
Describe how you could draw a diagram for a problem about finding the total length for two strings, 15 inches long and 7 inches
Varvara68 [4.7K]
Two strings are 15 inches and 7 inches long.

You could draw a diagram that has two rulers (that are longer than 12 inches).

Draw a piece of string that is exactly 15 inches on one ruler.
Draw another piece of string on the other ruler at exactly 7 inches.

Then you can find the total length of the two strings by adding 15 and 7 inches.
15 + 7 = 22

The total length of both the strings is 22 inches. You can draw a ruler and a piece of string on it at 22 inches.
5 0
3 years ago
Find the slope of each line from the graph.
Sunny_sXe [5.5K]

Answer:

a. 1/2

b. 5/3

c. 0

d. undefined

Step-by-step explanation:

7 0
2 years ago
1 - width; 7 cm height; 2 cm (Quantity: 50)
krek1111 [17]
The answer is 1,230. All you have to do is add everything on the right side you don’t have to worry about anything on the left.
6 0
3 years ago
Read 2 more answers
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