` g) ` ` x^2 -(2y)^2 = (x - 2y)(x + 2y) `
` h) ` ` x^2 - 1 = x^2 - 1^2 = (x - 1)(x + 1) `
` i) ` ` 4x^2 - 9y^2 = (2x)^1 - (3y)^2 = (2x - 3y)(2x + 3y) `
` k) ` ` x^3 - 1 = x^3 - 1^3 = (x - 3)(x^2 + x + 1) `
` l) ` ` 8 + x^3 = 2^3 + x^3 = (2 + x)(4 - 2x + x^2) `
` m) ` ` 8x^3 + 27 = (2x)^3 + 3^3 = (2x + 3)(4x^2 - 6x + 9) `