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Scorpion4ik [409]
3 years ago
7

Expand if necessary combine like terms (7+x)(7-x)=

Mathematics
1 answer:
mina [271]3 years ago
4 0

Answer:

49 - x^2

Step-by-step explanation:

(7+x)(7-x)

We know this is the difference of squares

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

7^2 - x^2 = 49-x^2

We can also FOIL

first = 7*7 = 49

Outer: = 7x

Inner: = -7x

Last : -x*x = -x^2

Add them together

49 +7x-7x - x^2

Combine like terms

49-x^2

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Use the disruptive property to simplify the expression 4(2x-4)
KIM [24]

Answer:

C.8x - 16

Step-by-step explanation:

multiple 4 with 2x = 8x,

then multiple 4 with -4 = -16

add 8x and -16 the answer is 8x - 16

5 0
3 years ago
Is 76 pounds of Christina's body weight comes from water about how much does Christina weigh
Ghella [55]
If 90% of bodies are water weight, then we have 10% left.

76+10% = 83.6.

83.6 total.
8 0
3 years ago
Rectangle 30 ft wide and 70 feet long. How long would diagonal corners be?
jonny [76]

Answer:

around 76.16

Step-by-step explanation:

30 squared + 70 squared = 5800

square root of 5800 = 76.16

a squared + b squared = c squared

5 0
3 years ago
3x^2-4x+1, match the following
il63 [147K]

Answer:

x = variable

3 = coefficient

1 = constant

3x^2-4x+1 = algebraic expression

2 = degree

Step-by-step explanation:

variables are typically the letters in equations (usually x and y)

coefficients are the numbers attached to the variables

constants don't have any variables attached

algebraic expressions are the full expression

degrees are the small numbers in the top right corners on either constants, variables or coefficients

Hope this helps!

8 0
3 years ago
Find the rate of change: Mike can bike 3 miles in an hour. What is the speed at which mike can bike?
masya89 [10]
Rate  of  change=<span><span>change  in  y divided by </span><span>change  in  <span>x
y= 3,6,9
x= 1,2,3
The numbers chosen above are because if mike travels 3 miles in one hours then he can travel 6 miles in two hours and 9 miles in 3 hours. 
Change in y = 3
Change in x = 1
3 / 1 = 3
So, the rate of change is 3.</span></span></span>
3 0
3 years ago
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