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jeka94
4 years ago
11

Factor completely 81x2 − 4. (6 points) (2x − 9)(2x − 9) (2x − 9)(2x + 9) (9x − 2)(9x − 2) (9x − 2)(9x + 2)

Mathematics
2 answers:
Ganezh [65]4 years ago
6 0

Answer:

(9x+2)(9x-2)

Last option is correct.

Step-by-step explanation:

The given expression is 81x^2-4

Write the expression in perfect squares

(9x)^2-2^2

Apply the difference of squares formula: a^2-b^2=(a+b)(a-b)

Here, a = 9x, b = 2

(9x)^2-2^2\\\\=(9x+2)(9x-2)

Therefore, the factored form is (9x+2)(9x-2)

Last option is correct.

Orlov [11]4 years ago
4 0
(9x-2)(9x+2)
81x^2+18x-18x-4
81x^2-4
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Help with this question ??
salantis [7]

Answer:

15 units per unit

Step-by-step explanation:

From the graph we can easily tell that y increases from 0 to 15 as x increases from 2 to 3.  

Thus, the average rate of change of f(x) on the interval [2, 3] is:

    1         15 - 0       15 units

--------- * ----------- = -------------- = 15 units (rise) per unit (run).

 3 - 2          1                 1

6 0
3 years ago
Haruka hiked several kilometers in the morning. She hiked only 666 kilometers in the afternoon, which was 25\%25%25, percent les
katen-ka-za [31]

Answer:

She hiked 1,554 kilometers in all.

Step-by-step explanation:

Let the hiking kilometers for morning be x

Given that:

Hiking kilometers in afternoon = 666

According to given condition that afternoon kilometers are 25% less than morning:

x = 666 + 25% of x

By simplifying:

x = 666 + 0.25x

x - 0.25x = 666

0.75x = 666

Dividing both sides by 0.75 we get:

x = 666/0.75

x = 888 kilometers

She hiked 888 kilometers in morning

And

Total = 888 + 666 =1554 km

i hope it will help you!

3 0
3 years ago
Read 2 more answers
What is 452 X 652 + 79
lidiya [134]
ANSWER: 294,783

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294,704+79=294,783
5 0
3 years ago
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PLEASE HELP ITS DUE IN LIKE30 min !!!!!!!!!Give the following functions f(x) and g(x),solve (f/g) (-5) and select the correct an
Bingel [31]

Answer:

The answer is -32

Step-by-step explanation:

g(-5) = (-5)-1= -6

f(-6) = 2(-6)-20

f(-6) = -12-20

-32

6 0
4 years ago
There are 11 books on a shelf. 5 of these books are new. (a) What is the ratio of new books to used books? (b) What is the ratio
ser-zykov [4K]
A) 
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b) 
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Hope this helps!
8 0
3 years ago
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