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Mathematics 18 Online
OpenStudy (anonymous):

...

OpenStudy (anonymous):

7. What is the solution to \[x=\sqrt{2x+3}\] ?

OpenStudy (anonymous):

A.3 B.-1 C.3 and -1 D.-3 and 1

OpenStudy (solomonzelman):

\[x=\sqrt{2x+3}\]square both sides \[x^2=2x+3\]\[x^2-2x-3=0\]can you do it from there?

OpenStudy (solomonzelman):

\[(x+1)(x-3)=0~~~~~~~~~~~~~~~~you~~~~tell~~~~me~!\]

OpenStudy (anonymous):

1 & -3

OpenStudy (solomonzelman):

Nope the other way,\[-1 ~~~~~~~~~~~~~and~~~~~~~~~~~~3\]

OpenStudy (anonymous):

oh

OpenStudy (solomonzelman):

-1 or 3 make it equal to zero, right?

OpenStudy (anonymous):

yeah i see

OpenStudy (solomonzelman):

\[(-1+1)(-1-3)=0~~~~~~~~~~~~~~OR~~~~~~~~~~~~~~(3+1)(3-3)=0\] GOOD!!

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