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(4x + 1)(4x + 1) = 12x² + 3x
16x² + 4x + 4x + 1 = 12x² + 3x
16x² + 8x + 1 = 12x² + 3x
16x² + 8x + 1 - 12x² - 3x = 0
4x² + 5x + 1 = 0
(4x + 1)(x + 1) = 0
Pemfaktoran : ( 4x + 1 )( x + 1)