Answer :

The given identity is (a+b) (a–b) = a2 –b2

(i) (x – 6) (x + 6)


Using the given identity


Here a = x and b = 6


= x2 – 62


= x2 – 36


(ii) (3x + 5)(3x + 5)


Using the given identity


Here a = 3x and b = 5


= (3x)2 – 52


= 9x2 – 25


(iii) (2a + 4b)(2a – 4b)


Using the given identity


Here a = 2a and b = 4b


= (2a)2 – (4b)2


= 4a2 – 16b2


(iv)


Using the given identity


Here



=


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