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/sci/ - Science & Math

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1771857

Anonymous Sat Sep 18 13:31:08 2010 No.1771857 [Reply] [Original]

2x^2-5=8 Show your work.

>>	Anonymous Sat Sep 18 13:33:08 2010 No.1771862 File: 11 KB, 424x288, 1270960067506.jpg [View same] [iqdb] [saucenao] [google]

>>	Anonymous Sat Sep 18 13:34:08 2010 No.1771863 2x^2-5=8 2x^2=13 x^2 =6.5 x= square-root of 6.5

>>	Anonymous Sat Sep 18 13:35:08 2010 No.1771864 >2x^2=13 >x^2 =6.5 what the fuck just happened

>>	Anonymous Sat Sep 18 13:37:08 2010 No.1771868 (sqrt(13))/2

>>	Anonymous Sat Sep 18 13:37:08 2010 No.1771869 >>1771864 divided both sides by two faggot

>>	Anonymous Sat Sep 18 13:37:08 2010 No.1771872 Sure. 2x^2-5=8 2x^2-5+5=8+5=13 (2x^2)/2=13/2 x^2=6.5 Sqr(6.5)=2.54950976 x=2.54950976.

>>	Anonymous Sat Sep 18 13:38:08 2010 No.1771875 2x^2 = 13 x^2 = 6.5 x = sqrt[6.5 x = 2.55

>>	Anonymous Sat Sep 18 13:39:08 2010 No.1771880 http://www.wolframalpha.com/input/?i=2x^2-5%3D8

>>	Anonymous Sat Sep 18 13:39:08 2010 No.1771885 Really, iit is +-2.54950976 There are two answers.

>>	Anonymous Sat Sep 18 13:41:08 2010 No.1771889 Possible intermediate steps: 2 x^2-5 = 8 Add 5 to both sides: 2 x^2 = 13 Divide both sides by 2: x^2 = 13/2 Take the square root of both sides: x = -sqrt(13/2) or x = sqrt(13/2)

>>	Anonymous Sat Sep 18 13:41:08 2010 No.1771890 (2)*(x^2) - 5 = 8 everyone just did the math for you op for some reason, but that's just the separation based on how you should order your operations.