Question

(x+a[elevado a 2])(x-a[elevado a 2]) + a[elevado a 2] (a[elevado a 2] - 1)

Answer 1

(x + a^2)(x - a^2) + a^2(a^2 - 1)
x^2 - ax^2 + ax^2 - a^4 + a^4 - a^2
x^2 - a^2