Question

What is the nature of roots of the quadratic equation 4x² – 12x – 9 = 0?

Answer 1

Step-by-step explanation:

4x² - 12x - 9 = 0 .

On comparing the given equation with ax² + bx + c = 0  

Here, a = 4 , b = - 12  , c = - 9

4x² - 12x - 9 = b² – 4ac

= (- 12)² - 4 × 4 × - 9

= 144  + 144

= 288

Since, 288 > 0  

Therefore, root of the given equation 4x² - 12x - 9 = 0 are real and distinct.

Hence, nature of roots of the quadratic equation 4x²− 12x − 9 = 0 are real and distinct.

If D = 0 roots are real and equal  

If D > 0 roots are real and distinct

If D < 0  No real roots