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student18474

不等式

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  • leung_po_chuen
    2020-09-15 13:25:22

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  • 解數雜貨店
    2020-09-15 19:45:10
    11) 4x²+kx+k+12 > 0 The curve opens upward. The entire curve is greater than zero if it doesn’t cross the x-axis, k²-4(4)(k+12) > 0 k²-16k-192> 0 (k+8)(k-24) > 0 -8 < k < 24 12) kx²+8x+3k < 2 kx²+8x+3k-2 < 0 The curve must open downward and doesn’t cross the x-axis, k < 0 and 8²-4(k)(3k-2) < 0 64-12k²+8k < 0 0 < 3k²-2k-16 0 < (3k-8)(k+2) (k < -2 or k > 8/3) and k < 0 k < -2

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