(3x+9)+(-4+4)

Question

im lost on how this is solved

 

Answer 1

Your mean simplified, not solved.

 

Notice that the second expression enclosed in parentheses is zero.

 

That leaves you with 3x+9. DONE.

 

One could solve an equation, if asked to set the expression equal to zero: 3x+9 = 0 has SOLUTION x= -3.

 

SOLVE only pertains to equations, inequalities, etc.