Question

If the equations x² − ax + b = 0 and x² + bx − a = 0 have a common root, then : 

(a) a = b 

(b) a + b = 0 

(c) a + b = 1 

(d) a − b = 1

Answer 1

Correct option (d) a − b = 1

Explanation:

Let α be the common roots of the given equations. Then