Question

Даю 20 балов
Срочно!!
Помогите

Answer 1

1) (9x^2-16)(9x^2+16)-(9x^2-1)^2=81x^4-256-81x^4+18x^2-1=18x^2-257

2) (4x^2-25)(4x^2+25)-(4x^2-3)^2=16x^4-625-16x^4+24x^2-9=24x^2-634