a. 3x²- 9x +13 et 3( x - 3/2 ) ² + 25/4
3( x - 3/2 ) ² + 25/4
=3(x²-3x+9/4)+25/4
=3x²-9x+27/4+25/4
=3x²-9x+13
b. - 1/2 ( x - 2 ) ² + 8 et 1/2 ( 6-x) (x+2)
1/2 ( 6-x) (x+2)
=1/2(-x²+4x+12)
=-1/2x²-2x²+6
- 1/2 ( x - 2 ) ² + 8
=-1/2(x²-4x+4)+8
=-1/2x²+2x-2+8
=-1/2x²+2x+6
c. 0.1x² + 2x - 10 et 0.1(x+10)² - 20
0.1(x+10)² - 20
=0,1(x²+20x+100)-20
=0,1x²+2x+10-20
=0,1x²+2x-10