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Sagot :

Bonjour,

a)

15x -3x² -10 +2x -4x² -24x

= -7x²  -7x -10

b)

(-6 +6x )(6-2x)

=  -36 +12x +36x -12x²

= -12x²  +  48x -36

c)

(2x +3x) (  5x+1)

=  10x² +2x +15x² +3x

= 25x²  +5x

d)

(-2x² -2) ( x-2)

= -2x³ +4x²  -2x +4

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