(x^2+1)(x^2-1) - (4x^2-7)^2
Expanding the terms:
= (x^4 - 1) - (16x^4 - 56x^2 + 49)
= x^4 - 1 - 16x^4 + 56x^2 - 49
= -15x^4 + 56x^2 - 50
Therefore, the solution is -15x^4 + 56x^2 - 50.
(x^2+1)(x^2-1) - (4x^2-7)^2
Expanding the terms:
= (x^4 - 1) - (16x^4 - 56x^2 + 49)
= x^4 - 1 - 16x^4 + 56x^2 - 49
= -15x^4 + 56x^2 - 50
Therefore, the solution is -15x^4 + 56x^2 - 50.