Ответ:
1) х² + 7х = 0
х*(х + 7) = 0
= 0
х+7=0
= -7
2) z² - 3z = 0
z*(z - 3)=0
z-3=0
= 3
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Ответ:
1) х² + 7х = 0
х*(х + 7) = 0
= 0
х+7=0
= -7
2) z² - 3z = 0
z*(z - 3)=0
= 0
z-3=0
= 3