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Ytochka33d
@Ytochka33d
March 2022
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Зайки,ну и последнее))
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sangers1959
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21.
(x-12)*(3x+9)=0
x-12=0 x₁=12
3x+9=0 |÷3 x+3=0 x₂=-3
Ответ: x₁=12 x₂=-3.
22.
(x+2)²=0
x+2=0
x=-2
Ответ: x=-2.
23.
x²+7x=0
x*(x+7)=0
x₁=0
x+7=0
x₂=-7
Ответ: x₁=0 x₂=-7.
24.
x²-25=0
(x+5)*(x-5)=0
x₁=-5 x₂=5
Ответ: x₁=-5 x₂=5.
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Answers & Comments
Verified answer
21.(x-12)*(3x+9)=0
x-12=0 x₁=12
3x+9=0 |÷3 x+3=0 x₂=-3
Ответ: x₁=12 x₂=-3.
22.
(x+2)²=0
x+2=0
x=-2
Ответ: x=-2.
23.
x²+7x=0
x*(x+7)=0
x₁=0
x+7=0
x₂=-7
Ответ: x₁=0 x₂=-7.
24.
x²-25=0
(x+5)*(x-5)=0
x₁=-5 x₂=5
Ответ: x₁=-5 x₂=5.