Question

if 2 is the root of the equation x2+bx+12=0& the equation x2+bx+q=0 has equal roots then q=?​

Answer 1

Answer:

q= -16

Step-by-step explanation:

2 is the root of x²+bx+12=0

2²+b(2)+12=0

2b=-12-4

2b= -16

b=-8------(1)

(1) in x²+bx+q=0

x²+(-8)x+q =0

x²-8x+q=0

this eq has equal roots

so b²- 4ac =0

-8²-4*1*q=0

-{64+4q} =0

4q= -64

q=-16