Question

2x cube-5x cube -19x+42 hit and trial method

please answer fast

Answer 1

Answer:

$2 {x}^{3} - 5 {x}^{2} - 19x + 42 \\ = 2 {x}^{3} - 6 {x}^{2} + {x}^{2} - 3x - 16x + 42 \\ = 2 {x}^{2} (x - 3) + x(x - 3) - 16(x - 3) \\ = (x -3)(2 {x}^{2} + x - 16)$