Question

(Х+1)(х^2-х+1)-х(х+3)(х-3) при х =1 равно 10. Даю 10 баллов.

Answer 1

$(x + 1)(x {}^{2} - x + 1) - x(x + 3)(x - 3) = 10 \\ (x {}^{ 3} + 1) - ( - x {}^{3} + 9x) = 10 \\ x {}^{3} + 1 + x {}^{3} + 9x = 10 \\ 1 + 9x = 10 \\ 9x = 10 - 1 \\ 9x = 9 \\ x = \frac{9}{9} \\ x = 1$