1. x^{4} + 2x^{3} - 7x^{2} - 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. x^{4} - 6x^{3} + 3x^{2} + 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. x^{4} - 17x^{2} + 16 = 0

a) x = 1, 4

b) x = ±1, ±16

c) x = ±1, ±4

d) x = 1, 16

6. x^{6} + 7x^{3} - 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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