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- a²-6an-9n²+1
-(a+3n)²+1
1²-(a+3n)²
(1-(a+3n)) (1+(a+3n))
(1-a-3n) (1+a+3n)
(-a-3n+1) (a+3n+1)
b) n² - 6n + 9 - x²
n² -6n-x² +9
(n-3)² -x²
((n-3)-x) ((n-3)+x)
(n-3-x) (n-3+x)
(n-x-3) (n+x-3)
c) y² + 16 - 8y - 64x²
y²-8y-64x² +16
16+y² -8y-64x²
(y-4)² -64x²
(y-4)²-(2^3.x)²
((y-4)-2^3.x)((y-4)+2^3.x)
(y-4-8x)(y-4+8x)
(y-8x-4)(y+8x-4)