Bonsoir j'ai besoin d'aide sil vous plait pour mon devoir maison c'est pour demain

développer et simplifier les expressions

[tex](6x - 3) {}^{2} + (4x - 5)(4x + 5) = [/tex]
[tex](7x - 3) {}^{2} - (2x + 3) {}^{2} = [/tex]

factoriser les expressions

A=
[tex]9x {}^{2} - 1 + (3x - 1)(x + 6) = [/tex]
B=
[tex](2x - 1)(x + 3) - 2x + 1 = [/tex]
C=
[tex](3x - 4)(2x + 3) - (4 - 3x)(x + 7) = [/tex]
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