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

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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} .

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Asked 12/1/2014 6:20:37 AM

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

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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

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Solve the equation by factoring. x2 = 81

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Question

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

1 Answer/Comment

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

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

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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]

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

1 Answer/Comment

andrewpallarca

x^2 - 2x - 8 = 0;
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Added 12/1/2014 7:14:27 AM

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