1.y³-16y = y(y²-16) = y(y-4)(y+4)3a²-6ab+3b² = 3(a-b)²
2.a) (3a-a²)² - a²(a-2) + 2a(7+3a) = 9a² - 6a² + a⁴ - a³ + 14a + 6a² = a⁴ - a³ + 17ab) y² - 6x - 9 = (y-3)(y+3) - 6x
1.
y³-16y = y(y²-16) = y(y-4)(y+4)
3a²-6ab+3b² = 3(a-b)²
2.
a) (3a-a²)² - a²(a-2) + 2a(7+3a) = 9a² - 6a² + a⁴ - a³ + 14a + 6a² = a⁴ - a³ + 17a
b) y² - 6x - 9 = (y-3)(y+3) - 6x