Semnul.pdf
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SEMNUL FUNCŢIEI PĂTRATICE
I. Cazul Δ > 0 x f(x)
-∞ x1 x2 semn a 0 semn contrar a 0
Cazul Δ = 0 x f(x)
-∞
-b/2a +∞ semn a 0 semn a
Cazul Δ < 0 x f(x)
+∞
-∞ semn a
+∞ semn a
I. Cazul Δ > 0 x f(x)
-∞ x1 x2 semn a 0 semn contrar a 0
Cazul Δ = 0 x f(x)
-∞
-b/2a +∞ semn a 0 semn a
Cazul Δ < 0 x f(x)
+∞
-∞ semn a
+∞ semn a
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