221.

If  then the value of  is

• 3

• 4

• 6

• 9

If x² = y + z,  y² = z + x  and z² = x + y, then the value of 
    is

• 1

• 2

• 0

• -1

If x² - 3x + 1 = 0,  then the value of  is

• 2

• 6

• 8

• 10

If a² + b² + 4c² = 2(a + b - 2c) - 3 and a, b, c are real, then the value of (a² + b² + c²) is

• 

• 2

• 

• 3

If a + b + c = 0, then the value of
 is

• 9

• 0

• 8

• -3

If  then the value of 12 * 4 is

• 48

• 19

• 20

• 21

If a, b and c are non-zero,  then the value of abc is

• -3

• 1

• -1

• 3

If x ≠ 0,  y ≠ 0  and z ≠ 0 and 
,  then the relation among x, y and z is

• 

• x = y = z

• x + y + z = 0

• x + y = z

If x² + y² + z² = 2(x - y - z) - 3, then the value of 2x - 3y + 4z is (assume that x, y and z) are all real numbers).

• 3

• 0

• 9

• 1

If a² + 1 = a,  then the value of a¹² + a⁶ + 1 is

• 2

• 3

• -3

• 1