(-x-1)(1-x) (5m-n)(-5m-n)

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(-x-1)(1-x) (5m-n)(-5m-n)

(-x-1)(1-x) (5m-n)(-5m-n)
(-x-1)(1-x) (5m-n)(-5m-n)

(-x-1)(1-x) (5m-n)(-5m-n)
(-x-1)(1-x)
=(-x)²-1
=x²-1
(5m-n)(-5m-n)
=(-n)²-(5m)²
=n²-25m²