Posted by Maria on .
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,
wrong...
x^2 times (2x+1 )
equals 2x^3 + 2x^2 7 =0 
Math 
betty,
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,
What about the x?

Math 
Reiny,
Maria, you are correct
x = 12 is the right answer, since x= 4 does not verify when you try it back in the original.