Question

8^a raiz quadrada de 7x+4=512

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Answer 1

$8^{ \sqrt{7x+4}} =512 \\ \\\not 8^{ \sqrt{7x+4} }=\not8^3 \\ \\ ( \sqrt{7x+4} )^2=3^2 \\ \\ 7x+4=9 \\ \\ 7x=9-4 \\ \\ 7x=5 \\ \\ x= \frac{5}{7}$