Предмет: Математика, автор: kraverska

знайдіть корені рівняння x квадрат+4x-21=0

Ответы

Автор ответа: Marzha777

x²+4x-21=0
D=16+4*21=100
x1=(-4-10)/2=-7
x2=(-4+10)/2=3

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