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12 cards from this deck
a2−b2=(a+b)(a−b)a^2-b^2=(a+b)(a-b)a2−b2=(a+b)(a−b)
No, must be memorized
A term expressed as a product of the same term
(3)(3)(3)(3)(3)(3)
(x)(x)(x)(x)(x)(x)
(5ab)(5ab)(5ab)(5ab)(5ab)(5ab)
Square terms separated by a minus
Rewrite in form a2−b2a^2-b^2a2−b2 to identify aaa and bbb
(y+10)(y−10)(y+10)(y-10)(y+10)(y−10)
(9x2)2−(4y4)2(9x^2)^2-(4y^4)^2(9x2)2−(4y4)2
When HCF factorisation is needed first
2x(x+5)(x−5)2x(x+5)(x-5)2x(x+5)(x−5)
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