hasil dari (2×+5)(3×-1)

[tex](2x + 5)(3x - 1) \\ 6 {x}^{2} - 2x + 15x - 5 \\ 6 {x}^{2} + 13x - 5[/tex]

[tex]2x \: . \: 3x = {6x}^{2} [/tex]
[tex]2x \: . \: - 1 = - 2x[/tex]
[tex]5 \: . \: 3x = 15x[/tex]
[tex]5 \: . \: - 1 = - 5[/tex]
[tex] = {6x}^{2} - 2x + 15x - 5[/tex]
[tex] = {6x}^{2} + 13x - 5[/tex]