math
posted by lindsay on .
solve the following absolute value question
/4x + 5/ =25

assume 4x+5 is positive, then 4x>5 or x>1.2 AND
4x+5=25 or 4x=20 or x=5, which meets both of the requirement above.
assume 4x+5 is negative, then 4x<5, or x<1.25, AND 4x+5=25 or 4x=30, and x=7.5 which meets the requirement
x= 7.5 or x=5