Question

If the equations a + ay − z = 0, 2x − y + az = 0, and ax + y + 2z = 0 are consistent, then a is equal to : 

(a) 2, 3 

(b) −2, 2 

(c) 2 ± √3, −2 

(d) 1 ± √3, −2

Answer 1

Correct option (d) 1 ± √3, −2

Explanation:

The equations are