PLEASE HELP ME FACTOR THIS!!

  (k +2j)(4k -j)

Step-by-step explanation:

Multiply the first and last coefficients to find their product:

  (4)(-2) = -8

Factor this product until you find factors that have a sum of +7. Since you want a positive sum, it works well to start with small negative factors.

  -8 = -1×8 . . . . these have the desired sum: (-1) +(8) = +7

Now, rewrite the middle term using these factors:

  4k² -jk +8jk -2j²

Factor each pair of terms

  k(4k -j) +2j(4k -j)

Recognize these new terms have a common factor, and factor that out:

  (k +2j)(4k -j) . . . . . the factorization you're looking for

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