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Sagot :

Réponse :

H = 4x²-12x+9

I = x²+12x+36

J = 1-81x²

K = x²+14x+49

L = 9x²-6x+1

M = (5+9x)(5-9x)

N = (11+2a)(11-2a)

Explications étape par étape :

(a+b)² = a²+2*a*b+b²

(a-b)² = a²-2*a*b+b²

(a+b)(a-b) = a²-b²

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