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 +6) ( 5x+1)
=10x² +2x +30x +6
= 10x² +32x +6
d)
(-2x² -2)( x-2)
= -2x³ +4x² -2x +4
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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 +6) ( 5x+1)
=10x² +2x +30x +6
= 10x² +32x +6
d)
(-2x² -2)( x-2)
= -2x³ +4x² -2x +4