Question

Answer the question quickly

Answer 1

x² + ax + 1 = 0 __________ (1 )

x² + xi + a = 0 _____________  ( 2 ) 

sub .. equation 2 form 1 

ax - x - a + 1 = 0 


x ( a -1 )  -a + 1 = 0 

x = $\frac{a- 1 }{a -1 }$

x = 1 


now 

putting the value in equation 1 

1 + a + 1 =0 

a = -2