x^2+px+4≠0
Δ<0
Δ=p²-4*1*4=p²-16
p²-16<0
(p-4)(p+4)<0
p=4 vp=-4
p∈(-4,4)
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x^2+px+4≠0
Δ<0
Δ=p²-4*1*4=p²-16
p²-16<0
(p-4)(p+4)<0
p=4 vp=-4
p∈(-4,4)