Solve the equation by factoring. x2 = 81

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Asked 12/1/2014 6:18:22 AM

Updated 12/4/2014 10:11:41 PM

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Flagged by janezeshun [12/4/2014 9:09:07 PM]

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User: Solve the equation by factoring. x2 = 81

Weegy: (x-9) (x+9)<0
jeifunk|Points 38004|

User: Solve the equation by factoring. x2 = 81

Question

Asked 12/1/2014 6:18:22 AM

Updated 12/4/2014 10:11:41 PM

1 Answer/Comment

This conversation has been flagged as incorrect.

Flagged by janezeshun [12/4/2014 9:09:07 PM]

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janezeshun

x^2 = 81
x^2 - 81= 0
(x - 9)(x+ 9) = 0
when x - 9 = 0 , x = 9
when x + 9 = 0 , x = -9

Added 12/4/2014 10:11:41 PM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [12/5/2014 4:31:24 AM], Rated good by andrewpallarca

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Solve the equation by factoring. x2 = 81 a. {81,9} b. { -9,9} c. {9,0} d. {0,0}

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Question

Updated 12/2/2014 8:11:24 PM

1 Answer/Comment

janezeshun

x^2 = 81
when x*x = 9*9 , x= 9
when x*x= (-9)*(-9) , x= -9
So the solution for x^2 = 81 is {-9 ,9} .

Added 12/2/2014 8:11:24 PM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [12/2/2014 8:21:40 PM], Rated good by andrewpallarca

Solve the equation by using the Square Root Property. x2 - 2x + 1 = 18

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Question

Updated 12/4/2014 2:17:39 AM

1 Answer/Comment

janezeshun

x^2 - 2x + 1 = 18
(x - 1)^2 = 18
x - 1 = ±3*2^1/2
x = ±3*2^1/2 + 1

Added 12/4/2014 2:17:39 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [12/4/2014 6:58:34 AM]

Which of the following is not a theory for the decline of the Mayan civilization? a. a natural disaster c. a lack of invention and adaptation b. the invasion by another group d. an internal revolt

Weegy: The invasion by another group is not a theory for the decline of the Mayan civilization. en.wikipedia.org/wiki/Minoan_civilization (More)

Question

Updated 12/1/2014 8:08:08 AM

0 Answers/Comments

Which of the following is the sum of the solutions of x2 - 2x -8 = 0? a. -6 c. 2 b. -4 d. -2

Weegy: The sum of x2 - 2x -8 = 0 is equal to d. -2 (More)

Question

Updated 12/1/2014 7:14:29 AM

1 Answer/Comment

andrewpallarca

x^2 - 2x - 8 = 0;
(x - 4)(x + 2) = 0;
x - 4 = 0;
x = 4;
x + 2 = 0;
x = -2;
The sum of of the solutions of x^2 - 2x -8 = 0 is 2.
4 + (-2) = 2

Added 12/1/2014 7:14:27 AM

This answer has been confirmed as correct and helpful.

Write a synonym of the word manifest.

Weegy: A synonym for manifest is: palpable. (More)

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Updated 12/3/2014 1:21:51 PM

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