Hasil dari (x -4) (5x + 1) adalah​

(x – 4) (5x + 1)

= x(5x + 1) – 4(5x + 1)

= 5x^2 + x – 4(5x + 1)

= 5x^2 + x – 20x – 4

= 5x^2 + 19x – 4 ✔

Penjelasan dengan langkah-langkah:

(x – 4) (5x + 1)

(x . 5x + x . 1) (-4 . 5x + (-4 . 1))

5x² + x -20x – 4

5x² -19x -4