(3x+1)^4 pkai cara Ya kak (segitiga Pascal)

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1

(3x+1)^4
= x^4 + 4(x^3×1) + 6(x^2×1^2)+ 4(x × 1^3) + 1^4
= x^4 + 4x^3 + 6x^2 + 4x + 1

semoga membantu