1) 3х² - 12 = 0
х² - 4 = 0
х = ±2
2) 3х² + 7х = 0
х ( 3х + 7) = 0
х = 0,
3х + 7 = 0
х = -7/3
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Answers & Comments
1) 3х² - 12 = 0
х² - 4 = 0
х = ±2
2) 3х² + 7х = 0
х ( 3х + 7) = 0
х = 0,
3х + 7 = 0
х = -7/3