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2 years ago

Factor Completely: x2 - 81 A.(x-9)(x+9) B.(x+9)(x+9) C.(x-9)(x-9) D.(9-x)(9+x)

Mathematics

2 answers:

svetoff [14.1K]2 years ago

8 0

Answer:

the answer is A

Step-by-step explanation:

i just did it on usa testprep

Hunter-Best [27]2 years ago

7 0

Answer is A

The binomial can be factored using the difference of squares formula a2-b2 = (a+b) (a-b) where a=x and b=9

(X+9) x(x-9)

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zmey [24]

Answer:

Part 1) The inequality that represent this situation is $5(x+7)^{2} \geq1,050$ or $5x^{2}+70x+245 \geq1,050$

Part 2) Yes, 8 inches is a reasonable width for his tablet

Step-by-step explanation:

Part 1)

Let

L -----> the length of the screen television

W ----> the width of the screen television

x ----> the width of Andrew's tablet

we know that

$L=5W$ ------> equation A

$W=x+7$ ----> equation B

The area of the television is

$A=LW$ -----> equation C

Substitute equation A and equation B in equation C

$A=5(x+7)(x+7)$

$A=5(x+7)^{2}$

$5(x+7)^{2} \geq1,050$

$5(x^{2}+14x+49) \geq1,050$

$5x^{2}+70x+245 \geq1,050$ ------> inequality that represent this situation

Part 2) Determine if 8 inches is a reasonable width for his tablet

For x=8 in

Substitute in the inequality

$5(8+7)^{2} \geq1,050$

$5(15)^{2} \geq1,050$

$1,125 \geq1,050$ -----> is true

therefore

Yes, 8 inches is a reasonable width for his tablet

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2 years ago

What is the End Behavior of the following Graph?

natima [27]

Answer:

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2 years ago

The implication x => y is equivalent to ??

saveliy_v [14]

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Hope this helps! :)

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2 years ago

Read 2 more answers

Find the perimeter and area of the figure below.

hichkok12 [17]

Answer:

perimeter = 40

area = 46(unit)^2

Step-by-step explanation:

Perimeter - all sides added together

Find unknown sides (8-3 = 5, 12-2 = 10)
Add all sides together (8+2+5+10+3+12 = 40)

Area - Length multiplied by width

Divide shape into two rectangles (#1 is 2x5 and #2 is 3x12)
Find individual area (rectangle #1: 2*5 = 10 / rectangle #2: 3*12 = 36)
Add areas together (10+36 = 46)
Finish with unit squared (46___^2)

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3 years ago