(3a -a²)² - a²(a - 2)(a +2) + 2a(7 + 3a²) = 9a² - 6a³ + a⁴ - a²(a² -4) + 14a + 6a³ =
= 9a² + a⁴ - a⁴ + 4a² + 14a = 13a² +14a
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(3a -a²)² - a²(a - 2)(a +2) + 2a(7 + 3a²) = 9a² - 6a³ + a⁴ - a²(a² -4) + 14a + 6a³ =
= 9a² + a⁴ - a⁴ + 4a² + 14a = 13a² +14a