What are the like terms of -x, -8x^2, and -2.

What is the like term of 5 j^2 k^2?

For example, a like term for -x is -2x; for -8x^2 is -4x^2; for -2 is -4 or -3. That is you have an x term, an x^2 term, and a constant term (no x or x^2).