(a + 2)⁴ = (a + 2)²⁺² = (a + 2)² · (a + 2)² = (a² + 4a + 4)(a² + 4a + 4) =
= a⁴ + 4a³ + 4a² + 4a³ + 16a² + 16a + 4a² + 16a + 16 =
= a⁴ + 8a³ + 24a² + 32a + 16
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(a + 2)⁴ = (a + 2)²⁺² = (a + 2)² · (a + 2)² = (a² + 4a + 4)(a² + 4a + 4) =
= a⁴ + 4a³ + 4a² + 4a³ + 16a² + 16a + 4a² + 16a + 16 =
= a⁴ + 8a³ + 24a² + 32a + 16