Question

срочно алгебра два примера​

Answer 1

$1) {x}^{3} + 8 - x( {x }^{2} - 9) - 42 = \\ {x}^{3} + 8 - {x}^{3} + 9x - 42 = \\ 9x - 36 \\ 2) {x}^{3} - 27 - {x}^{3} + 16x + 21 = \\ 16x - 6$