# Express the follo

(i) We use

(x + 2z)(2x + z) =

(x + 2z)(2x + z) =

(ii) 4(x + 2y)(2x + y) = (2x + 4y)(4x + 2y)

We use

4(x + 2y)(2x + y) =

4(x + 2y)(2x + y) = ( 3x + 3y)2-(2y – 2x)2

(iii) We use

(x + 98)(x + 102) =

(x + 98)(x + 102) = (x + 100)2-(x-100)2

(iv) 505 × 495 = (500 + 5)(500-5)

We use (a + b)(a - b) = a2 - b2

505 × 495 = 5002-52

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