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amina8881456
@amina8881456
November 2021
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помогите срочнооо решить В1 и В2
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sangers1959
Verified answer
B1.
2x²-2x-10≥0
x²-x-5≥0 D=21
x=(1+√21)/2≈2,8 x=(1-√21)/2≈-1,8
(x-2,8)(x+1,8)≥0
-∞______+______-1,8_____-______2,8_______+______+∞
x∈(-∞;-1,8]U[2,8;+∞).
B2.
y=2x²-5x+1 x₀=2
yk=y(x₀)+y`(x₀)*(x-x₀)
y(2)=2*2²-5*2+1=-1
y`(2)=4x-5=3
yk=-1+3(x-2)=-1+3x-6=3x-7
yk=3x-7.
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Answers & Comments
Verified answer
B1.2x²-2x-10≥0
x²-x-5≥0 D=21
x=(1+√21)/2≈2,8 x=(1-√21)/2≈-1,8
(x-2,8)(x+1,8)≥0
-∞______+______-1,8_____-______2,8_______+______+∞
x∈(-∞;-1,8]U[2,8;+∞).
B2.
y=2x²-5x+1 x₀=2
yk=y(x₀)+y`(x₀)*(x-x₀)
y(2)=2*2²-5*2+1=-1
y`(2)=4x-5=3
yk=-1+3(x-2)=-1+3x-6=3x-7
yk=3x-7.