Question

The discriminant of the quadratic equation 4x² – 12x + 9= 0 is *
(a) 25
(b) 20
(c) 0
(d) 6​

Answer 1

Answer:

Step-by-step explanation:

Given : 4x² - 12x - 9 = 0 .

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

Here, a = 4 , b = - 12  , c = - 9

D(discriminant) = b² – 4ac

D = (- 12)² - 4 × 4 × - 9

D = 144  + 144

D = 288

Since, D > 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.

★★ NATURE OF THE ROOTS

If D = 0 roots are real and equal  

If D > 0 roots are real and distinct

If D < 0  No real roots

Answer 2

Answer:

Step-by-step explanation:

Here , we have

a = 4 , b= -12 , c= 9

Discriminant = b^2 -4 ac

= (-12)²-4(4)(9)

= 144 - 144 = 0

So, option c that is 0 is correct