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2. x^2 +4x- 21
3. (4a - 5b)^2 = 14a^2-40ab+ 25 b ^2
4.(2a+ 3b ) ^2 = 4a ^2 + 12 ab + 9 b ^2
5. (6x-2y) ^2 = 36 x ^2 - 24 xy + 4y^2
NB: ^2 = kuadrat