Réponses

2013-02-08T16:40:29+01:00

F(X)=4(X+1)(X-3)=-8

F(X)=(4X+4)(X-3)=-8

=4X²-12X+4X-12=-8

=4X²-8X-12+8=0

Δ=b²-4ac

Δ=(-8)²-4*4*8

Δ=64-128

Δ=-64