Question

Solve the equation $|3x|=x-21$

• A. -5.25 or 10.5
• B. 5.25 or 10.5
• C. -5.25 or -10.5
• D. 5.25 or -10.5

Answer 1

The correct option is D 5.25 or -10.5

$|3x|=x-21$
$3x=x-21$ $-3x=x-21$
$2x=-21$ $-4x=-21$
$x=-\frac{21}{2}$ $4x=21$
$x=-10.5$ $x=5.25$
Correct answer is option D.