Tolong bantu jawab dengan benar beserta caranya ya!!!

2a)(1×4),(2×5),(3×6),(4×7),(5,8),(6,9),(7×10),(8×11),....
b)(2×1),(2×2),(2×3),(2×4),(2×5),(2×6),(2×7),(2,8),(2×9),(2×10),...
c)(2+1),(3+2),(4+3),(5+4),(6+5),(7+6),(8+7),(9+8),(10+9),...

3a)
(2x + 3)^4
= (2x + 3)^2 × (2x + 3)^2
= (4x^2 + 12x + 9)(4x^2 + 12x + 9)
= 16x^4 + 48x^3 + 36x^2 + 48x^3 + 144x^2 + 108x + 36x^2 + 108x + 81
= 16x^4 + 96x^3 + 216x^2 + 216x + 81

b)
(x + y)^3
= (x + y)(x + y)^2
= (x + y)(x^2 + 2xy + y^2)
= x^3 + 2x^2y + xy^2 + x^2y + 2xy^2 + y^3
= x^3 + 3x^2y + 3xy^2 + y^3