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Nature of Roots

Find the disc...

Question

Find the discriminant for the given equation:
$3 x^{2} + 2 x - 1 = 0$

A

11

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B

13

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C

15

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D

16

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Solution

The correct option is D $16$
Given equation is,
$3 x^{2} + 2 x - 1 = 0$
We know, $D = b^{2} - 4 c$
$a = 3, b = 2, c = - 1$
$D = 2^{2} - 4 \times 3 \times (- 1)$
$D = 4 + 12$
$∴ D = 16$

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