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Sagot :

Bonsoir,

F: (x+3)(2x-1) - 3x(2x+5)=

2x² -x +6x -3 -6x² -15x =

-4x² -11x -3

G: (4t+1)(4t-1) - (3t+2)²=

16t² -4t +4t -1 -( 9t² +12t +4) =

16t² -4t +4t -1 - 9t² -12t -4 =

7t² -12t -5

revois les identités remarquables

SOFIADKYER123

Réponse:

F: (X+3)(2x-1) - 3x(2x+5)

= 2x^2-x+6x-3-6x^2-15x

= 2x^2-6x^2-x+6x-15x-3

= -4x^2-12x-3

G: (4t+1)(4t-1) - (3t+2)

= 16t^2-4t+4t-1-3t+2

= 16t^2 -4t+4t-3t-1+2

=16t^2-3t+1

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