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

Math  betty, Tuesday, March 31, 2009 at 7:09pm
wrong...
x^2 times (2x+1 )
equals 2x^3 + 2x^2 7 =0

Math  betty, Tuesday, March 31, 2009 at 7:12pm
ohhh I'm so sorry. I misread the question...but your answer is still wrong
you would square both sides by 2
and then and up w/ 2x+1 = 49

Math  Maria, Tuesday, March 31, 2009 at 7:15pm
What about the x?

Math  Reiny, Tuesday, March 31, 2009 at 7:49pm
Maria, you are correct
x = 12 is the right answer, since x= 4 does not verify when you try it back in the original.
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