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Sagot :

Bonsoir;

1)

8x² +2x -12x -3 + 10x² -16x -15x +24

= 18x²  -41x  +21

2)

18 * (-1)²   -4&*( -1)+21

= 18  +41 +21

= 80

3)

(2x-3) (  4x+1 +5x-8)

= (2x-3) ( 9x -7)

4)

soit

2x-3 = 0

2x= 3

x = 3/2

soit:

9x-7 = 0

9x = 7

x = 7/9

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