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(1+×)(×-1)-(4+×)(×-4)
(×+1)(×-1)-(×+4)(×-4)
x^2 - 1 - x^2 - 16
-17
2.-
(2+×)(×+8)-(5+×)^2
2x+16+x^2 +8x -(5^2 + 2.x.5 + x^2 )
10x+16+x^2 -25 -10x - x^2
16-25
-9
3.-
(5×+1)^2 + (5×-1)^2 -50x^2
2 ((5x)^2 + 1) - 50x^2
2 (25x^2 +1) - 50x^2
50x^2 +2 - 50x^2
2