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# D

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by

## Giovanni Davide Guarino

on 16 May 2015

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#### Transcript of D

LE DISEQUAZIONI
una disequazione di 2° grado ridotta a forma normale ha al primo membro un polinomio di 2° grado nell' incognita x,al secondo membro lo zero
ponendo la disequazione=y risolverla significa trovare i valori di x affinchè y sia maggiore,maggiore-ugulale ,minore, o minore-uguale a zero
<

Δ>

Δ>0

Δ>0

ax²+bx+c≤0
a(x- )(x- )≤0
SS
x-
x-
x≥
x≥
+
-
+
≤x≤
S

.
.
x
2
x
1
x
2
x
1
x
1
≥0
≥0
x
x
2
x
2
x
2
:
1
x
1
x
1
x
2
x
2
ax²+bx+c<0
a(x- )(x- )<0
SS
x-
x-
x>
x>
+
-
+
<x<
S
x
2
x
1
x
2
x
1
x
1
>0
>0
x
x
2
x
2
:
1
x
1
x
2
ax²+bx+c≤0
a(x- )(x- )≤0
SS
x-
x-
x≥
x≥
+
-
+
≤x≤
S
.
.
x
2
x
1
x
2
x
1
x
1
≥0
≥0
x
x
2
x
2
:
1
x
1
x
2
ax²+bx+c<0
a(x- )(x- )<0
SS
x-
x-
x>
x>
+
-
+
<x<
S
x
2
x
1
x
2
x
1
x
1
>0
>0
x
x
2
x
2
:
1
x
1
x
2
ax²+bx+c>0
a(x- )(x- )>0
SS
x-
x-
x>
x>
+
-
+
S
x
2
x
1
x
2
x
1
x
1
>0
>0
x
x
2
x
2
:
1
x
1
x
2
x<
V x>
ax²+bx+c>0
a(x- )(x- )>0
SS
x-
x-
x>
x>
+
-
+
S
x
2
x
1
x
2
x
1
x
1
>0
>0
x
x
2
x
2
:
1
x
1
x
2
x<
V x>
ax²+bx+c≥0
a(x- )(x- )≥0
SS
x-
x-
x≥

x≥

+
-
+
S
x
2
x
1
x
2
x
1
x
1
≥0
≥0
x
x
2
x
2
:
1
x
1
x
2
x≤

V x≥

.
.
ax²+bx+c≥0
a(x- )(x- )≥0
SS
x-
x-
x≥

x≥

+
-
+
S
x
2
x
1
x
2
x
1
x
1
≥0
≥0
x
x
2
x
2
:
1
x
1
x
2
x≤

V x≥
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