Question

resolva a equaçao irracional da raiz quadrada de 2x + 7 = 4

Answer 1

$\sqrt{2x+7}=4 \\ \\ (\sqrt{2x+7})^2 =4^2 \\ \\ 2x+7=16 \\ \\ 2x=16-7 \\ \\ 2x=9 \\ \\ x=9/2 \\ \\ Prova \\ \\ \sqrt{2. \frac{9}{2}+7 } = 4 \\ \\ \sqrt{9+7} =4 \\ \\ \sqrt{16} =4 \\ \\ 4=4$

Answer 2

raiz quadrada de 2x + 7 = 4
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√( 2x + 7)²    = 4²

2X + 7 = 16 ==> 2X = 2X = 16-7 ==> 2X = 9 ==>X = 9/2