Sagot :
Développer :
- 5 (x - 1)² + 20
= - 5 (x² - 2x + 1) + 20
= - 5x² + 10x - 5 + 20
= - 5x² +10x + 15
- 5 (x - 1)² + 20
= - 5 (x² - 2x + 1) + 20
= - 5x² + 10x - 5 + 20
= - 5x² +10x + 15
[tex]-5(x-1)^2+20 \\ =-5(x^2-2x+1)+20 \\ =-5x^2+10x-5+20 \\ \boxed{=-5x^2+10x+15}[/tex]