Jika diketahui
persamaan kuadrat x2 – 3x – 4 = 0 dan X = { x I x, -3 < x < 3
}
Buat grafik fungsi
persamaan kuadrat !
f(x) = x2
– 3x – 4, x = { -3, -2, -1, 0, 1,
2, 3 }
·
f(-3)
= (-3)2 – 3(-3) – 4
=
14
·
f(-2)
= (-2)2 – 3(-2) – 4
=
6
·
f(-1)
= (-1)2 – 3(-1) – 4
=
0
·
f(0)
= (0)2 – 3(0) – 4
=
-4
·
f(1)
= (1)2 – 3(1) – 4
=
-6
·
f(2)
= (2)2 – 3(2) – 4
=
-6
·
f(3)
= (3)2 – 3(3) – 4
=
-4
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