Maths-
General
Easy

Question

The absolute value inequality 5 less or equal than vertical line x vertical line minus n is graphed below. What is the value of n?

The correct answer is: |x|≥5+n Thus, we can see that no value of n will satisfy the graph.


    Hint:
    |x| is known as the absolute value of x. It is the non-negative value of x irrespective of its sign. The value of absolute value of x is given by
    vertical line x vertical line equals open curly brackets table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell negative x comma x less than 0 end cell row cell x comma x greater or equal than 0 end cell end table close
    The symbol |.| is pronounced as ‘modulus’. We read |x| as ‘modulus of x’ or ‘mod x’.
    First we find out which inequality represents the graph and then compare it with the given inequality.
    Step by step solution:
    The given graph is

    From the graph, we can observe that the line between -7 and 7 is shaded. The end points are darkened balls and hence are included in the graph.
    So the value of x lies between -7 and 7, that is
    -7 ≤ x ≤ 7
    We can rewrite the above inequality in terms of modulus as follows,
    |x| ≤ 7
    The given inequality is
    5 ≤ |x| - n
    Adding n on both sides and rewriting the inequality, we get
    |x| ≥ 5 + n
    Thus, we can see that no value of n will satisfy the graph.
    Note:
    If the given inequality was 5 ≥| x| - n, then we would get |x| ≤ 7, which gives the value of n = 7.
    Geometrically, |x|  is the positive distance of the point x from the origin on the real line.

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