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Sagot :

Bonjour,

(5X+4)(3X+5)-(6X+3)x(2X-7)

(5X+4)(3X+5) = 15x² +25x +12x +20 = 15x² +37x +20

(6X+3)x(2X-7) = 12x² -42x +6x -21

15x² +37x +20 -( 12x² -42x +6x -21)=

15x² +37x +20 - 12x² +42x -6x +21=

3x² + 73x =41

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