Question

Plz help me to solve this...
Plz explain also..
I will mark u brainly..

Answer 1

(b) x^2 - 9=0
is the answer.
Explanation:
x^2 - 9=0
=> X^2 = 9
=> X = + 3 and - 3

Sum = +3 + (-3) =0

Answer 2

Answer:

x² - 9 = 0

Step-by-step explanation:

Let the roots of the quadratic equation be x and y.

(i)

Given that One root of a quadratic equation is 3.

⇒ x = 3.

(ii)

Given that sum of roots is 0.

⇒ x + y = 0

⇒ 3 + y = 0

⇒ y = -3.

Now,

(iii)

Product of roots:

⇒ xy

⇒ 3(-3)

⇒ -9.

Therefore, the required quadratic equation:

⇒ x² - (sum of roots)x + Product of roots = 0

⇒ x² - (x + y)x + (xy) = 0

⇒ x² - (0)x + (-9) = 0

⇒ x² - 9 = 0

Therefore, the answer is x² - 9 = 0  --- Option(B).

Hope it helps!