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(A) (2x+3y)(2x+3y)
4x²+6xy+6xy+9y²
4x²+12xy+9y²
(B) (4p-3q)(4p-3q)
16p²-12pq-12pq-9q²
16p²-24pq-9q²
(C) (x+3)(x+9)
x²+9x+3x+27
x²+12x+27
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