WARNING: CARE MUST BE TAKEN WHEN SOLVING MOD EQUATIONS.

There are several methods but you must know when you can use them. Hopefully these videos will show you.

Type 1 : Mod on one side of the ‘=’ and some x’s on the other side not in a mod.

Example: Solve

  1. |x + 1| = -2x – 5
Mod Equations : How to solve |x+1|= -2x-5 : ExamSolutions - youtube Video

Type 2: Mod on one side of the ‘=’ and a constant (just a number) on the other side

Example: Solve

  1. |x – 2| = 3

Note: There are 3 methods of solution

Mod Equations : How to solve |x-2|= 3 : ExamSolutions - youtube Video

Type 3: Mod on both sides of the ‘=’ sign

Example: Solve

  1. |3x + 9|=|2x + 1|

Note: There are 2 methods of solution

Mod Equations : How to solve |3x+9|=|2x+1| : ExamSolutions - youtube Video