Q. 114.4( 32 Votes )

Find the product (3x – 7)(3x + 7) using a suitable identity.

Answer :

Concept Used:


(a + b)(a – b) = a2 – b2


Explanation:


Let a = 3x, b = 7


Then,


(3x – 7)(3x + 7) = (3x)2 – (7)2


(3x – 7)(3x + 7) = 9x2 – 49


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