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Sagot :

Bonjour,

 8x+20 +5 x² -7x -15x +21

= 5x² -14x +41

4x²` -12x +9 - ( 4x² -12x +x -3)

=  4x²` -12x +9 -  4x² +12x -x +3

= -x +12

x²  +5x -3x -15 - ( -3x²+15x +2x -10)

= x²  +5x -3x -15 +3x²-15x -2x +10

= 4x² -15x -5

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