Question

Очень нужно (x-1)^4+21(x-1)^2-100=0

Answer 1

${t}^{2} + 21t - 100 = 0 \\ t = - 25t = 4 \\ (x - 1) {}^{2} = - 25 \\ (x - 1) {}^{2} = 4 \\ x = - 1 \\ x = 3 \\ x = - 1 \\ x = 3$