SOLUTION: Solve √(2x+3) - √(2x)=1
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Question 178168: Solve √(2x+3) - √(2x)=1
Found 2 solutions by stanbon, Mathtut:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Solve √(2x+3) - √(2x)=1
Square both sides to get:
2x+3 -2sqrt(2x(2x+3) - 2x = 1
Combine:
-2sqrt(4x^2+6x) = -2
sqrt(4x^2+6x) = 1
Square both sides to get:
4x^2 + 6x = 1
Rearrange:
4x^2 + 6x -1 = 0
Use quadratic formula:
x = [-6 +- sqrt(36 - 4*4*-1] / 8
x = [-6 +- sqrt(52)/8
x = [-6 +- 2sqrt(13)]/8
x = [3 +- sqrt(13)]/4
============================
Check the answers to see if any are extraneous.
===============================================
Cheers,
Stan H.
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
:
added sqrt of 2x from both sides
:
squaring both sides...
:
multiplied out right side
:
isolated sqrt on right and combined like terms on left
:
divided by 2
:
squared both sides
:
divided both sides by 2 to isolate variable x
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