1) 4x² + 16x = 0
4х (х + 4) = 0
4х = 0 х + 4 = 0
х=0 х = -4
Ответ: -4 ; 0
2) 5x² - 7x = 0
х (5х - 7) = 0
х = 0 5х - 7 = 0
5х = 7
х = 1,4
Ответ: 0 ; 1,4
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Answers & Comments
1) 4x² + 16x = 0
4х (х + 4) = 0
4х = 0 х + 4 = 0
х=0 х = -4
Ответ: -4 ; 0
2) 5x² - 7x = 0
х (5х - 7) = 0
х = 0 5х - 7 = 0
5х = 7
х = 1,4
Ответ: 0 ; 1,4