Value of discriminant of the equation x 2-1-0 isA- 4B- -2C- 2D- -4

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Standard X

Mathematics

Discriminant

Value of disc...

Question

Value of discriminant of the equation $x^{2} + 1 = 0$ is

-2

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-4

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Solution

The correct option is D -4
For equation $a x^{2} + b x + c = 0$ , expression $b^{2} - 4 a c$ is called discriminant and is denoted by D.

For equation $x^{2} + 1 = 0$ , a = 1, b = 0 and c = 1.
Then,
$D = b^{2} - 4 a c = 0 - (4 \times 1 \times 1) = - 4$

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Value of discriminant of the equation x2+1=0 is

The correct option is D -4For equation ax2+bx+c=0, expression b2−4ac is called discriminant and is denoted by D. For equation x2+1=0, a = 1, b = 0 and c = 1. Then, D=b2−4ac =0−(4×1×1) =−4

Value of discriminant of the equation $x^{2} + 1 = 0$ is

The correct option is D -4
For equation $a x^{2} + b x + c = 0$ , expression $b^{2} - 4 a c$ is called discriminant and is denoted by D.

For equation $x^{2} + 1 = 0$ , a = 1, b = 0 and c = 1.
Then,
$D = b^{2} - 4 a c = 0 - (4 \times 1 \times 1) = - 4$