Question

(х-2)(х+2)-(х-1)^2 (^2 во второй степени)

Answer 1

$(x - 2)(x + 2) - (x - 1) {}^{2} \\ x {}^{2} - 4 - (x {}^{2} - 2x + 1) \\ x {}^{2} - 4 - x {}^{2} + 2x - 1 \\ - 5 + 2x$