Answer :

(i) We use the form (a + b)(a-b) = a2 - b2


(2t + 5)(2t – 5) = 4t2-25


(ii) We use the form (a + b)(a-b) = a2 - b2


(xy + 8)(xy – 8) = x2y2-64


(iii) We use the form (a + b)(a-b) = a2 - b2


(2x + 3y)(2x – 3y) = 4x2-9y2


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