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(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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