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Sagot :

Heyyyyy

Réponse :

A= 2x²+13x+15

B= 36x²-102x+72

Explications étape par étape :

A= ( x + 5 ) ( 2x + 3 )

A= x×2x +x×3 +5×2x+5×3

A= 2x²+3x +10x+15

A= 2x²+13x+15

B= ( 9x - 12 ) ( 4x - 6 )

B= 9x×4x +9x×(-6) -12×4x -12×(-6)

B= 36x²-54x-48x +72

B= 36x²-102x+72

Rappel :

(a+b)(c+d)= a×c+a×d+b×c+b×d= ac+ad+bc+bd

#ApprendsAvecNosDevoirs

#MeryemML♡

Bonsoir,

Double distributivité

A= ( x + 5 ) ( 2x + 3 )

x*2x = 2x²

x* 3 = 3x

5*2x = 10x

5*3 = 15

=>  2x² +3x +10x +15 = 2x²  +13x +15

B= ( 9x - 12 ) ( 4x - 6 )

9x * 4x = 36x²

9x* -6 = -54x

-12* 4x  = -48x

-12* -6 =72

=> 36x² -54x -48x +72 =36x² -102x +72

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