Question:
a2 – b2 is equal to
(a) (a – b)2
(b) (a – b) (a – b)
(c) (a + b) (a – b)
(d) (a + b) (a + b)
Solution:
(c) (a + b) (a – b)
(a2 – b2) = (a + b) (a – b) is one of the standard identity.
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