Question

Calcule (2x-4)elevado ao quadrado =72

Answer 1

${(2x - 4)}^{2} = 72 \\ 2x - 4 = + - \sqrt{72} \\ 2x - 4 = + - 6 \sqrt{2} \\ \\ 1. \: 2x - 4 = 6 \sqrt{2} \\ 2x = 6 \sqrt{2} + 4 \\ x = 3 \sqrt{2} + 2 \\ \\ 2. \: 2x - 4 = - 6 \sqrt{2} \\ 2x = - 6 \sqrt{2} + 4 \\ x = - 3 \sqrt{2} + 2$