Friday, July 11, 2014

Given the function f(x)=x-2m+2 what is m if the graph of the function does not intersect x axis? x>0

If the graph of the function (which is a line) does not
intercept the x axis, that means that the equation of the line has no real
solutions.


In other words, there are no such values for x
to cancel the equation of the line.


When the graph is
intercepting x axis, then y = 0.


Let f(x) =
y.


Since the graph is not intercepting x axis, then y
> 0 =>


x-2m+2 >
0


We'll isolate x to the left
side:


x > 2m - 2


Since
x > 0 => 2m - 2 > 0


We'll divide by
2:


m - 1 > 0


m >
1


The interval of possible values for m, for
the graph of f(x) not to intercept x axis, is: (1 ,
+infinite).

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