Complex Numbers And Quadratic Equations question 777
Question: Roots of $ ax^{2}+b=0 $ are real and distinct if
Options:
A) $ ab>0 $
B) $ ab<0 $
C) $ a,b>0 $
D) $ a,b<0 $
Show Answer
Answer:
Correct Answer: B
Solution:
$ B^{2}-4AC>0 $ Þ $ 0-4ab>0 $ Þ $ ab<0 $ .