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4x2 + 4x + 1
= 4x2 + 2x +2x +1
= 2x (2x + 1) + 1 (2x + 1)
= (2x + 1) (2x + 1)
Faktorkan persamaan kuadratnya
4x² + 4x + 1 = 0
( 2x + 1 ) ( 2x + 1 )
Cocokan dengan ( ax + 1 ) ( ax + 1 )
( 2x - 1 ) ( 2x - 1 )
( ax + 1 ) ( ax + 1 )
Jika kita tulis
( 2x + 1 ) tepat karena hasilnya -½
Jadi nilai a adalah 2