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Sagot :

Bonjour,

a)

15x -3x² -10 +2x -4x² -24

=  -7x² +17x -34

b)

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

= -36x +12 +36x² -12x

= 3-x² -48x +12

c)

(2x+6)( 5x+1)

=  10x² +2x +30x +6

=10x² +32x +6

d)

(-2x² -2) ( x-2)

= -2x³+4x ²-2x +4

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