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nastya97531
@nastya97531
July 2022
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m11m
Verified answer
(y+3)² - (y-3)² = 1.5(y-3)(y+3)
y² +6y+9 -(y² -6y+9)=1.5(y² -9)
y² +6y+9-y² +6y-9=1.5y² -13.5
-1.5y² +12y+13.5=0
y² - 8y - 9=0
D=64+36=100
y₁=(8-10)/2= -1
y₂=(8+10)/2=9
Ответ: -1; 9.
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Answers & Comments
Verified answer
(y+3)² - (y-3)² = 1.5(y-3)(y+3)
y² +6y+9 -(y² -6y+9)=1.5(y² -9)
y² +6y+9-y² +6y-9=1.5y² -13.5
-1.5y² +12y+13.5=0
y² - 8y - 9=0
D=64+36=100
y₁=(8-10)/2= -1
y₂=(8+10)/2=9
Ответ: -1; 9.