7x 2 4x 7 2x 4 July 8, 2019 16 32 64 128 7x 2 2x 7 )+ 4x 42 7x 1 7 4x 4y 2 2x 4y 2 2x 7 (4x − 7) 2 ≥ (7x − 4) 2
