Entre os 4 trinômios dados, há 2 que são quadrados perfeitos. Faça a fatoração deles.

A-) x²+ 16x + 64

B-) 4x² + 6xy - 8y

C-) 16x² + 8xy + 2y²

D-) 9x² + 12xy +4y²

Obs:

Por favor, me ajudem, estou tendo dificuldades com esta questão...

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