Which board geometrically represents 4x2 – 1 using algebra tiles? An algebra tile configuration showing only the product spot, which has 9 tiles in 3 columns with 3 rows. First row: 2 x squared, 1 x. Second row: 2 x squared, 1 x. Third row: 2 negative x, 1. An algebra tile configuration showing only the product spot, which has 9 tiles in 3 columns with 3 rows. First row: 2 x squared, 1 x. Second row: 2 x squared, 1 x. Third row: 2 negative x, 1 negative. An algebra tile configuration showing only the product spot, which has 9 tiles in 3 columns with 3 rows. First row: 2 x squared, 1 negative x. Second row: 2 x squared, 1 negative x. Third row: 2 negative x, 1. An algebra tile configuration showing only the product spot, which has 9 tiles in 3 columns with 3 rows. First row: 2 x squared, 1 x. Second row: 2 x squared, 1 x. Third row: 2 x, 1.