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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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