Question

упрастите:х³+3х(х+4)-(х+2)³​

Answer 1

Ответ:

${x}^{3} + 3x(x + 4) - {(x + 2)}^{3} = {x}^{3} + {3x}^{2} + 12x - ( {x}^{3} + {6x}^{2} + 12x + 8) = {x}^{3} + {3x}^{2} + 12x - {x}^{3} - {6x}^{2} - 12x - 8 = { - 3x}^{2} - 8$