Can someone help me with this question which is combine like terms to create an equivalent expression -k +3k?

2k

Step-by-step explanation:

-k +3k = 2k

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square