Given the function [tex]\( f(x) = 0.5|x-4| - 3 \)[/tex], for what values of [tex]\( x \)[/tex] is [tex]\( f(x) = 7 \)[/tex]?

A. [tex]\( x = -24, x = 16 \)[/tex]

B. [tex]\( x = -16, x = 24 \)[/tex]

C. [tex]\( x = -1, x = 9 \)[/tex]

D. [tex]\( x = 1, x = -9 \)[/tex]



Answer :

To solve for the values [tex]\( x \)[/tex] that satisfy the equation [tex]\( f(x) = 7 \)[/tex], where the function is given by [tex]\( f(x) = 0.5|x - 4| - 3 \)[/tex], we'll follow these steps:

1. Set up the equation:
[tex]\[ 0.5 |x - 4| - 3 = 7 \][/tex]

2. Add 3 to both sides to isolate the absolute value expression:
[tex]\[ 0.5 |x - 4| = 10 \][/tex]

3. Multiply both sides by 2 to further isolate the absolute value expression:
[tex]\[ |x - 4| = 20 \][/tex]

4. The definition of the absolute value tells us that:
[tex]\[ x - 4 = 20 \quad \text{or} \quad x - 4 = -20 \][/tex]

5. Solve each of these linear equations separately:
[tex]\[ x - 4 = 20 \quad \Rightarrow \quad x = 24 \][/tex]
[tex]\[ x - 4 = -20 \quad \Rightarrow \quad x = -16 \][/tex]

Thus, the values of [tex]\( x \)[/tex] that satisfy [tex]\( f(x) = 7 \)[/tex] are [tex]\( x = 24 \)[/tex] and [tex]\( x = -16 \)[/tex]. Therefore, the correct answer is:

[tex]\[ \boxed{x = -16, x = 24} \][/tex]