2 3 x 15 12 July 8, 2019 16 32 64 128 3 2 3x )- 12 =- 15 2 3 6 15 x 123 2 3 2x 5 x 15 12 2 3 x 1 2 x 15 12 2 3 x 12 y 15 2 3 x 3 4 x 12 15 X 2 mũ 3 15 12 Solve $3 x 2 12x 15 0 by completing the square 5 6 x 12 )= 2 3 x 15 12 1 2 x 15 3 4 4x 3 12x 2 x 15 1 3 15 x 2 12 x 8