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April 26, 2015

Homework Help: Math

Posted by Maria on Tuesday, March 31, 2009 at 7:01pm.

x-sqrt(2x+1) = 7

My answer:
same as:

x - 7 = sqrt(2x+1)
==>

x^2 - 14x + 49 = 2x+1 ==>

x^2 - 16x + 48 = 0

split this up into:

(x - 12) * ( x - 4 ) = 0

so, x can technically be 12 or 4

12 - sqrt(24+1) does = 7

x=12

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