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Sagot :

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N = (t + 3) (3 + 4) – (5t - 3)

N = 3 t + 4 t + 9 + 12 - 5t+ 3

N =  2 t + 24

O = (x+5) (2x -5) - (3x ²-7x+5)

O = 2 x²- 5 x + 10 x - 25 - 3 x² + 7 x - 5

O = - x² + 12 x - 30

Réponse :

slt

Explications étape par étape :

N=(t+3)(3+4)−(5t−3)

N=(t+3)×7−(5t−3)

N =7t+21−(5t−3)

N= 7t+21−5t−(−3)

N= 7t+21−5t+3

N =2t+21+3

N =2t+24

O=(x+5)(2x−5)−(3x²  −7x+5)

O =2x²  +5x−25−(3x² −7x+5)

O =2x²  +5x−25−3x²  +7x−5

O =−x²  +5x−25+7x−5

O =−x²  +12x−25−5

O =−x²  +12x−30

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