-k+sqrt(k^2+4k-4)>4
    -x+sqrt(x^2-4+4x)>4
    -x+sqrt(x^2-4+x)>4
    1－x^2－2x＜4
    (60-x)(200+20x)≥24500
    (60-x)(200+x)≥24500
    x^5 +3*x^4-2*x^3+5*x^2-3*x- 1 < 0
    x^5>1
    p∧2+4p＜6-p p＞0
    p∧2+4p＜6-p
    p∧2+4p＜6
    -x^2-4x+3＞0
    2x^2+1> 9x−3
    12x-5x ^2>2
    x^2<2x+ 15
    x2<2x+ 15
    0 ≤x+3 < 5
    x−4≤2x+1
    7x+ 4<5x
    2x+6>9

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