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Answer:
0.4
Step-by-step explanation:
(5x + 2)² + (5x - 2)² / (5x + 2)² - (5x - 2)² = 13 / 12
⇒ (5x² + 20x + 4) + (5x² - 20x + 4) / (5x² + 20x + 4) - (5x² - 20x + 4) = 13 / 12
⇒ (10x² + 8 ) / (40x) = 13 / 12
⇒ 1 / 4x + 1 / 5x = 13 / 12
⇒ 5 / 20x + 4 / 20x = 13 / 12
⇒ 9 / 20x = 13 / 12
⇒ 260x = 108
⇒ x = 108 / 260
⇒ x = 0.4
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