Question

What is (13x + 9k) + (17x + 6k), simplified?

21x + 15k
21x + 23k
30x + 15k
30x + 23k

Answer 1

13x+17x=30x
9k+6k=15k
30x+15k

Answer 2

Remove the brackets

13x + 9k + 17x + 6k

Put the xs next to each other and the ks next to each other.

13x + 17x + 9k + 6k

Now add the xs together

30x + 9k + 6k                  

And finally add the ks together.

30x + 15k   <<<< Answer