3(x + 3) – 2x + 4

Question

 I don't know this question

Answer 1

3(x + 3) – 2x + 4  is an expression.  It has variables and constants.  It is evaluated following the P-E-M-D-A-S (Plase Excuse My Dear Aunt Sally) precedent rules.

Since the parentheses are evaluated first, distribute the 3 by multiplying to get:
                3x   +  9  - 2x  + 4

Then rearrange, using the commuting principle, to put the x terms together and the constants together:
                  3x  - 2x  + 9  + 4

Now, group the like terms to get the answer:
                  x  +  13

Note: when using such an expression in a formula, this helps you isolate a variable and thus solve an equation or a series of equations.

Answer 2

Is this a graph or solve for x? 

if it is solve for x, then a "=" sign is missing. 

If it is graph, then start with opening the brackets.

 

3(x+3) - 2x + 4

 

3(x+3) will become 3 multiplied for each component within the paranthesis.

3x + 3*3

3x + 9

Combine this with the second part.

 

3x + 9 - 2x + 4

 

move the components that are similar next to each other, with their respective signs so that you can work out the problem.

 

3x - 2x + 9 + 4

 

3x - 2x is 1x.

9+4 is 13

 

so this becomes

 

x+13.