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Sagot :

Bonsoir,

(3x+7) ( 5x-2) =

15x² -6x +35x -14 = 15x²+ 29x -14

(3x+8) ( 1-2x) =

3x -6x² +8 -16x  = -6x² -13x +8

15x²+ 29x -14 -(  -6x² -13x +8)=

15x²+ 29x -14 +6x² +13x -8 =

21x²+ 42x -22

Bonsoir

( 3x + 7 ) ( 5x - 2 ) - ( 3x + 8 ) ( 1 - 2x )

15x² + 35x -6x - 14 - ( 3x - 6x² + 8 - 16x )

15x² + 29 x - 14 - 3x + 6x² - 8 + 16x

21x² + 42 x - 22

Bonne soirée

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