If the image of quadratic function y = (M + 5) x2 + 2 (M + 1) x + m is all above the x-axis, then the value range of M is___ ．

∵ the images of quadratic function y = (M + 5) x2 + 2 (M + 1) x + m are all above the x-axis, ∵ (M + 5) > 0, ∵ 0, ∵ m ＞ - 5, 4 (M + 1) 2-4 (M + 5) × m ＜ 0, so m ＞ 13

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