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b = - 3
c = 5
(a + b) x (a - b)
(- 5 + (- 3)) x (- 5 - (- 3))
(- 5 - 3) x (- 5 + 3)
(- 8) x (- 2)
16
= (-5 + (-3)) x (-5 - (-3))
= (-5-3) x (-5+3)
= -8 x (-2)
= 16