1. x4 + 2x3 - 7x2 - 20x - 12 = 0
a) x = -2, -1, 3
b) x = -2, 1, 2, 3
c) x = -2, 1, 3
d) x = 1, 2, 3, 5
2. x4 - 6x3 + 3x2 + 10x = 0
a) x = -5, -1, 0, 2
b) x = -1, 0, 2, 5
c) x = -1, 0, 5
d) x = -2, 0, 1
3.
a) x = 0
b) ø
c) x = 1
d) x = 0, 1
4.
a) ø
b) x = -3
c) x = 3
d) x = 0
5. x4 - 17x2 + 16 = 0
a) x = 1, 4
b) x = ±1, ±16
c) x = ±1, ±4
d) x = 1, 16
6. x6 + 7x3 - 8 = 0
a) x = ±1, ±2
b) x = -1, 2
c) x = -2, 1
d) x = 1, 2
7.
a) x = 3; y = 2
b) x = -3; y = 2
c) x = -3; y = -2
d) x = 3; y = -2
8.
a) x = 3; y = 0
b) x = 3; y = -1
c) x = 0; y = -2
d) x = -3; y = 0
9.
a) x = -2, y = 2; x = 2, y = -2
b) x = -1, y = 1; x = 1, y = -1
c) x = -1, y = 1
d) x = -3, y = 3; x = 2, y = -2
10.
a) x = -1, y = 1; x = 1, y = -1
b) x = -2, y = 1/2; x = 1/2, y = -2
d) x = -1, y = 1; x = 1/2, y = -2
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