The partial factorization of x2 – 3x – 10 is modeled with algebra tiles.

an algebra tile configuration. 1 tile is in the factor 1 spot: and is labeled + x. 6 tiles are in the factor 2 spot: 1 is labeled + x and 5 are labeled negative. 18 tiles are in the product spot: 1 is labeled + x squared, 2 are labeled + x, the 5 tiles below + x squared are labeled negative x, and the 10 tiles below the + x tiles are labeled negative.
which unit tiles are needed to complete the factorization?

2 negative unit tiles
2 positive unit tiles
5 negative unit tiles
5 positive unit tiles