Question

Write these expressions as simply as possible

Answer 1

So it is asking you to group like term so
x terms can be grouped/added/subtracted to other x terms, but not to x^2 or x^3 terms
x^2 terms to x^2 and so on so

1.  9-3k+5k=
9+(5k-3k)=
9+2k

2.  k^2+2k+4k=
k^2+(2k+4k)=
k^2+6k=

Answer 2

$1)\ 9-3k+5k=9+2k\\\\2)\ k^2+2k+4k=k^2+6k=k(k+6)$