simplify the expression -4(x-3)+7(x+3) show all work. would the first step be to multiply -4 and 7 by the numbers inside the parenthesis?

Question

anonymous · Answer

Yes, distributing the -4 and the 7 would definitely be your first step.

anonymous · Answer

okay so that would be -4-12+7x+21?

anonymous · Answer

Correct. except it should be -4x not just -4.

anonymous · Answer

ooh yes sorry forgot the x haha

anonymous · Answer

Haha yeah, easy mistake to make. Now just add like terms and you're done.

anonymous · Answer

so then it would be 3x+9 right? and that would be my answer?

anonymous · Answer

Oops, looks like there was one other mistake I missed. When you multiply two negative numbers you get a positive number. Take another look at your work and I think you'll see where you went wrong.

anonymous · Answer

ooh would it be 4+12+7x+21 then?

anonymous · Answer

-4x instead of 4. Other than that completely correct.

anonymous · Answer

okay great! thank you! and then the 3x+9 would be the answer?

anonymous · Answer

Close, try grouping your like terms like this. It might be easier to evaluate. (7x-4x)+(21+12)

anonymous · Answer

3x+33 then

anonymous · Answer

Yep. Nice work.

anonymous · Answer

awwesome! thanks for the help!