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Find all real values of x for which

sqrt (4x^2 + 12x + 9) = 2x+ 3

 Dec 7, 2021
 #1
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0

It works for x >= 0, so the solution is [0,inf).

 Dec 7, 2021
 #2
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No, its 3/2 and inf

 Dec 7, 2021
 #3
avatar+203 
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Yeah, it's 3/2 and infinity.

 Dec 7, 2021
 #4
avatar+32985 
+2

A graph often helps:

 Dec 8, 2021

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