High School

Consider f(x) = |x-5|+3

for what values of x is y=x-5 positive? For what values of x is y =x-5 negative


Rewrite f as a piece wise function and graph

Answer :

Final answer:

For values of x greater than 5, y = x-5 is positive. For values of x less than 5, y = x-5 is negative. The function f(x) = |x-5|+3 can be rewritten as a piecewise function: f(x) = { x-5, if x < 5; |x-5|+3, if x ≥ 5 }. The graph of f(x) = |x-5|+3 is shown below:

Explanation:

To determine the values of x for which y = x-5 is positive, we need to consider the cases when (x-5) is positive or zero. When (x-5) is positive or zero, the absolute value function returns the input itself. Therefore, for y = x-5 to be positive, we need x-5 to be greater than zero.

Solving the inequality x-5 > 0, we add 5 to both sides to isolate x: x > 5.

So, for y = x-5 to be positive, x must be greater than 5.

To determine the values of x for which y = x-5 is negative, we need to consider the case when (x-5) is negative. When (x-5) is negative, the absolute value function returns the negation of the input. Therefore, for y = x-5 to be negative, we need x-5 to be less than zero.

Solving the inequality x-5 < 0, we add 5 to both sides to isolate x: x < 5.

So, for y = x-5 to be negative, x must be less than 5.

Now, let's rewrite f(x) as a piecewise function:

f(x) = { x-5, if x < 5; |x-5|+3, if x ≥ 5 }

Finally, let's graph the function f(x) = |x-5|+3:

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