segitiga paacal (2x+1)^4

(a + b)^4
= a⁴ + 4a³b + 6a²b² + 4ab³ + b⁴

••
(2x + 1)
= (2x)⁴ + 4(2x)³(1) + 6(2x)²(1)² + 4(2x)(1)³ + (1)⁴
= 16x⁴ + 32x³ + 24x² + 8x + 1