Answer 2.1:3

From Förberedande kurs i matematik 1

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a) \displaystyle (x+6)(x-6) b) \displaystyle 5(x+2)(x-2) c) \displaystyle (x+3)^2
d) \displaystyle (x-5)^2 e) \displaystyle -2x(x+3)(x-3) f) \displaystyle (4x+1)^2