simplify this expression 3(a + b ) - 3(a - b )

Question

Please help.

Answer 1

 

 3(a + b ) - 3(a - b )

first multiply out the 3, 

3a + 3b - 3a + 3b  now put the like terms together   

the 3a cancel out they add up to simply 0a    

3b + 3b   = 6b     

6b is your answer