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RuslanQa
@RuslanQa
August 2021
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(x-10)(x+2) больше или равно 160
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Irina0302
(x-10)(x+2) ≥160
x^2 +2x -10x-20≥160
x^2-8x-180≥0
D=64-4*(-180)=64+720=784=28^2
x1=(8+28)/2=18
x2=(8-28)/2=-10
-\-\-\-\-\-\-\-\- (-10) -----------------------(18)-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-
Ответ: х∈(-бесконечность; -10) ∨(18; + бесконечность)
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Answers & Comments
x^2 +2x -10x-20≥160
x^2-8x-180≥0
D=64-4*(-180)=64+720=784=28^2
x1=(8+28)/2=18
x2=(8-28)/2=-10
-\-\-\-\-\-\-\-\- (-10) -----------------------(18)-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-
Ответ: х∈(-бесконечность; -10) ∨(18; + бесконечность)