3 years ago

Factorize 9(a+1)^2-81

Mathematics

1 answer:

lora16 [44]3 years ago

6 0

Answer:

The answer is 9(a-2)(a+4).

Step-by-step explanation:

Use $a^{2} -b^{2} =(a-b)(a+b)$

$9(a+1)^{2} -81= 9( (a+1)^{2}-9)= 9( (a+1)^{2}-3^{2} )= 9(a+1-3)(a+1+3)\\=9(a-2)(a+4).$

You might be interested in

18x^2+21x-9 I need to figure out how to work this problem

shtirl [24]

$18x^2+21x-9=3(6x^2)+3(7x)-3(3)\\\\=3(6x^2+7x-3)=3(6x^2+9x-2x-3)\\\\=3[3x(2x)+3x(3)-1(2x)-1(3)]\\\\=3[3x(2x+3)-1(2x+3)]\\\\=\boxed{3(2x+3)(3x-1)}$

3 0

3 years ago

Read 2 more answers

Anybody willing to help?

alexandr402 [8]

Answer:

16 is H.9

17. is A.9

Step-by-step explanation:

Hope it helped! ^_^

6 0

3 years ago

Each exterior angle of a regular polygon is 24º.<br>How many sides does the polygon have?

valina [46]

Answer: 360 / 24 = 15

Step-by-step explanation :

Since the sum of the exterior angles is always 360 degrees, if you divide 360 degrees by 24 degrees you get 15 which is the number of equal exterior angles and therefore 15 vertices and sides to the polygon.

5 0

3 years ago

Read 2 more answers

population of Japan as of 2009 was about 127,000,000 (127 million). What percent of the world’s population is this?

Vladimir [108]

Current worlds population is 7.6 billion (7,600,000,000), so Japan’s population is equal to 1.67 % of the world’s population.

7 0

3 years ago

Hello everyone! could you please answer the following question with working? thanks!

maria [59]

Answer:65/77 is correct. im pretty sure

Step-by step explanation:

4 0

3 years ago

Factorize 9(a+1)^2-81​

Factorize 9(a+1)^2-81