Math Question.......?

Question

How would you do -3 I 2n+5 I = -9

Show work.

Answer 1

-3 l 2n+5 l = -9  divide both sides by -3

l 2n+5 l = 3  its absolute value, so

2n+5 = 3  -or-  2n+5 = -3  subtract 5 from both sides of both equations

2n = -2  -or-  2n = -8  divide both sides of both equations by 2

n = -1  -or-  n = -4

Answer 2

-3 I 2n+5 I = -9

so,

I 2n+5 I = -9/-3 = 3

then,

2n+5 = 3        or    2n+5 =-3

2n = 3-5=-2    or    2n = -3-5=-8

finally,

n = -2/2 = -1  or     n = -8/2 = -4

solution is -1 or -4