Répondre :

a) (2,5-b)(b-4)=2,5b-10-b^2+4b=-b^2+6,5b-10

b) (3x-2)(7-2x)=21x-6x^2-14+4x=-6x^2+25x-14
Asiya38
A. (2,5 - b)(b - 4)
= 2,5b -10 -b^2 +4b
= -b^2 +6,5 -10

B. (3x-2)(7-2x)
= 21x -6x^2 -14 +4x
= -6x^2 +25x -14

^ = puissance

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