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September 2021
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Решите неравенство : 98⩽2x²
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sedinalana
Verified answer
2x²-98≥0
2(x²-49)≥0
2(x-7)(x+7)≥0
x=7 x=-7
+ _ +
------------------------[-7]---------------[7]------------------
x∈(-∞;-7] U [7;∞)
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Answers & Comments
Verified answer
2x²-98≥02(x²-49)≥0
2(x-7)(x+7)≥0
x=7 x=-7
+ _ +
------------------------[-7]---------------[7]------------------
x∈(-∞;-7] U [7;∞)