1.A = (5x-13)²
2. B (5x-13)(5x+13)
3.2A +3B = 2(5x-13)² + 3(5x-13)(5x+13) = (5x-13)(10x-26+15x+39) = (5x-13)(25x+13)
4. A(-3/5) = (-16)² = 256
B(2V3) = 25.4.3 - 169 = 300 - 169 = 131
