Answer:
16.67
Step-by-step explanation:
3x² - 10 = 40
3x² = 40 + 10
x² = 50
x = 50 / 3
x = 16.67
±5√6 / 3
3x² = 50
x² = 50/3
x = ±√(50/3)
x = ±5 √(2/3)
Writing in proper form:
x = ±5 (√2 / √3) × (√3 / √3)
x = ±5√6 / 3
