If the quadratic equation ax² + bx + c

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Solution

Q.
If the quadratic equation $a x ² + b x + c = 0, a \neq 0$ has two real and equal roots, then ‘c’ is equal to

1 −b/2a

2 b/2a

3 $- b ² / 4 a$

4 $b ² / 4 a$

Ans.
(4)

Given quadratic equation $a x ² + b x + c = 0, a \neq 0 .$
For real and equal roots, discriminant = 0.

⇒ $b ² - 4 a c = 0 \Rightarrow b ² = 4 a c \Rightarrow c = b ² / 4 a$

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