Question

check out the attachment​

Answer 1

alpha×bita=c/a=12

alpha+ bita= -b/a=-k

or, (alpha+ bita)^2=k^2

or, (alpha- bita)^2+4×alpha×bita=k^2

or,(alpha- bita)^2=k^2-4×12

or,1=k^2-48

or, k^2=49

or,k=+7 or -7

so the answer is (D)...

I think it will help u ...

if it helps please mark me as a brain list,,,

please!!!!!