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Sagot :

Bonjour,

Développer:

N= (2x – 1)(2x + 1) + (5x – 3) ²= 4x²-2x+2x-1+25x²-15x-15x+9= 29x²-30x+8

P = (9x – 4)² – (7x + 5)(7x – 5)= 81x²-36x-36x+16-49x²+35x-35x-25

                                                = 81x²-72x+16-49x²+25= 32x²-72x+41

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