−1
0
1
2
3
4
5
6
7
−5
5
10
x
x
x
y
y
y
k
<
9
k<9
k
<
9
: two roots
k
=
9
k=9
k
=
9
: one contact
k
>
9
k>9
k
>
9
: no roots
threshold
−1
0
1
2
3
4
5
6
7
−5
5
10
x
x
x
y
y
y
y
=
(
x
−
3
)
2
−
4
y=(x-3)^2-4
y
=
(
x
−
3
)
2
−
4
1
1
1
5
5
5
(
3
,
−
4
)
(3,-4)
(
3
,
−
4
)
−1
0
1
2
3
4
5
−2.5
2.5
5
7.5
x
x
x
y
y
y
k
<
4
k<4
k
<
4
k
=
4
k=4
k
=
4
k
>
4
k>4
k
>
4
strictly above
ESAT
Genius
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Mathematics 2 · Algebra and functions
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