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Sagot :

a) (3x+1)²
= 9x²+6x+1

b) (-x+7)²
= x²-14x+49

c) (9-5x)(9+5x)
= 81+45x-45x-25x²
= -25x²+81
a) (3x+1)^2
9x^2+6x+1

identité remarquable

b) (-x+7)^2
x^2-14x+49

identité remarquable

c) (9-5x)(9+5x)
= 81+45x-45x-25x^2
= -
25x^2+81

identité remarquable

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