Répondre :
a(x) = 4x²-26x +30
=4(x²-13/2x)+30
=4(((x-13/4)²-169/16)+30
=4(x-13/4)²-49/4
=4(x²-13/2x)+30
=4(((x-13/4)²-169/16)+30
=4(x-13/4)²-49/4
forme cannonique:[tex]ax^2+bx+c=a(x^2+bx/a+c/a)=a((x+b/2a)^2-b^2/4a^2+c/a)= a(x+b/2a)^2-(b^2-4ac)/4a[/tex]