if youre good at pre-algebra?

Question

can you please EXPLAIN to me how to find the simplified answer of:

7k-2(3k+1)-9

i've done it over 4 times and i can't get the right answer. seriously im going crazy.

thanks :)

Answer 1

just skip it....-1 off your score isnt THAT big a deal

Answer 2

The first thing you want to do according to PEMDAS (Parenthesis, exponets, multiplication, division, addition, subtraction) is parenthesis, there is nothing you can do there so then move on to exponets, where there are none, then using the distributive property of multiplication, 3*4x=12x and 3*6=18 so 12x+18+7. 7+18 is 25. Then put it together. The x can't be added or subtracted because there are no other x's. Therefore the answer is 12x+25. The answer could be simplified more if it was 12x+24 because a 12 can be factored, because they have a 12 in common. If that was the case, the answer would be 12(x+2)

Answer 3

Do you mean =9? (not -9)

Well, assuming that what you have typed is accurate, then this is what I would do:

7k-2(3k+1)-9 Since there is no () around 7k-2, then it is not a term, so it doesn't go together. So, the 2 gets multiplied into the term (3k+1).

7k-(6k+2)-9 To get rid of the (), make 6k negative and 2.

7k-6k-2-9

k-11

Or, if you meant =9:
7k-2(3k+1)=9
7k-(6k+2)=9
7k-6k-2=9
k-2=9
k=9+2
k=11

Answer 4

first, you need to multiply the -2 times everything inside the parentheses (), so you take -2*3k and -2*1
that gives you -6k and -2
now, it reads 7k-6k-2-9
then, you can combine like terms
7k and -6k are similar because they both have a k
because 7-6=1, you get 1k, which is just k (1 multiplied by anything is always equal to what it is multiplied by)
-2 and -9 are like terms because they don't have a k
-2-9=-11
now, you're left with:
k-11
final anwswer!
hope this helps!

Answer 5

Original Equation:
7k-2(3k+1)-9

Expand the brackets:
= 7k -(2*3k )- (2*1) - 9
= 7k -6k - 2 - 9
= k - 11 (Final Ans)

Answer 6

I hope this helps:

first of all you must distribute and get rid of your parenthesis before doing anything else. So you would get: 7k-6k-2-9, this is because there is a negative sign in front of the 2, and in order to "open" the parenthesis you must multiply by 2 each and every term in your parenthesis, and since there's a negative sign in front of the 2, everything else is negative (-6k-2). Now you can add or subtract the like terms, meaning the ones that are just numbers and the ones that are numbers with variables. Therefore: 7k-6k-2-9 gives you, 1k-11, or just k-11.
I hope this was understandable. **** Luck.

Answer 7

First, remember this: Please Excuse My Dear Aunt Sally...
PEMDAS is the order you complete things in an equation.
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction.

Now, lets apply that to your equation.

7k-2(3k+1)-9

When you have a -2(3k+1), you multiply what's in the parenthesis by the number outside of it... so this part of the equation becomes -6k-2. Be careful to watch for that negative sign in front of the 2! It will change the equation if you forget to apply the negative to BOTH items inside the parenthesis.
Lets substitue that back into the equation.
7k-6k-2-9
Now, if we reduce this we get:
1k-11.
You don't need the 1 in front of the k (because 1*k=k),
so it should be :
k-11.

Does that make sense? If not, you can im me: [e-mail]

Answer 8

Is there supposed to be an equal sign in there somewhere?

If not, then the best you can do is:

Distribute the 2:

7k + (-2)(3)k + (-2)(1) -9
7k - 6k -2 -9
1k - 11

That's as far as you can go without an = something.

Answer 9

The simplest form is k-11 :

7k-2(3k+1)-9
7k-6k-2-9 (distributive property)
k-11 (combine like terms)

Answer 10

7k - 2(3k+1) - 9

The first thing I'd do is distribute that 2 into the parentheses.

7k - (6k + 2) - 9

Then I'd change the signs and remove the parentheses.

7k - 6k - 2 - 9

Finally, I'd combine like terms.

(7-6)k - (2+9)
(1)k - (11)

k - 11

Answer 11

Hi Katie, If you have to solve for k first you multiply
-2(3k+1) and you get -6k+-2. So now that you have finished multiplying everyting in parenthesis (you can now drop the parenthesis) you need to go back to the equation....
2k-6k-2-9. I hope this makes sense so far. Next, you need to combine the things that are alike. sssoooo 2k -6k gives you -4k and -2-9 gives you -11. So your equation should look like this so far:

2k-2(3k+1)-9
2k-6k-2-9
4k-2-9
4k-11

I am not sure if you need to go any further. Does your book give you an answer?