a) (2x + 3y)2 = 4x2 + … + 9y2
b) x2 – 9y2 = (x + …)(x – …)
c) (2x – 1)(4x2 + 2x + 1) = … – 1
d) 8x3 + 27 = (… + 3)(4x2 – 6x + 9)
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