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= 8x - 2
= 2(4x - 1)
b. 16x² + 16x + 4
= 4x² + 4x + 1
= (2x+1)(2x+1)
= (2x + 1)²
c. 4x² + 12xy + 9y²
= (2x+3y)(2x+3y)
= (2x + 3y)²