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7. What is the solution to \[x=\sqrt{2x+3}\] ?
A.3 B.-1 C.3 and -1 D.-3 and 1
\[x=\sqrt{2x+3}\]square both sides \[x^2=2x+3\]\[x^2-2x-3=0\]can you do it from there?
\[(x+1)(x-3)=0~~~~~~~~~~~~~~~~you~~~~tell~~~~me~!\]
1 & -3
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Nope the other way,\[-1 ~~~~~~~~~~~~~and~~~~~~~~~~~~3\]
oh
-1 or 3 make it equal to zero, right?
yeah i see
\[(-1+1)(-1-3)=0~~~~~~~~~~~~~~OR~~~~~~~~~~~~~~(3+1)(3-3)=0\] GOOD!!
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