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Difference of cubes
x³-y³=(x-y)(x²+xy+y²)
Sum of cubes
x³+y³=(x+y)(x²-xy+x²)
Perfect square
A²-2AB+B²=(A-B)(A-B)=(A-B)²
Perfect square 2
Zero factor property
x²-121=0 (x+11) (x-11) 121= 11 (11)
Absolute value