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Answer

x≥4.5x \ge 4.5

Step-by-step solution

3 steps

This is an inequality involving the greatest integer function.

  1. Interpret the inequality.

    The given inequality is:

    [2x−3]>5.12[2x - 3] > 5.12

    The greatest integer function [y][y] returns the largest integer less than or equal to yy.
    Since [2x−3][2x - 3] must be an integer and it must be greater than 5.12, the smallest possible integer value for [2x−3][2x - 3] is 6.
    Therefore, we can rewrite the inequality as:

    [2x−3]≥6[2x - 3] \ge 6
  2. Apply the property of the greatest integer function.

    If [y]≥n[y] \ge n (where nn is an integer), then it implies that y≥ny \ge n.
    Using this property, we can remove the greatest integer function:

    2x−3≥62x - 3 \ge 6
  3. Solve the linear inequality for xx.

    Add 3 to both sides of the inequality:

    2x≥6+32x \ge 6 + 3 2x≥92x \ge 9

    Divide both sides by 2:

    x≥92x \ge \frac{9}{2} x≥4.5x \ge 4.5

    The solution for xx is all real numbers greater than or equal to 4.5.

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