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katyak5
@katyak5
December 2021
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lnlmkhnv2
Замена: х²-8 = z
z²+3z=4
z²+3z-4=0
1-4+3=0 => z¹ = 1
z² = -4
обратная замена:
x²-8=1 | x²-8=-4
x²=9 | x²=4
x=±√9 | x= ±√4
x=±3 | x=±2
Ответ: х1=±3 х2=±2
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Answers & Comments
z²+3z=4
z²+3z-4=0
1-4+3=0 => z¹ = 1
z² = -4
обратная замена:
x²-8=1 | x²-8=-4
x²=9 | x²=4
x=±√9 | x= ±√4
x=±3 | x=±2
Ответ: х1=±3 х2=±2