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 $ .