Which of the following is not a quadratic equation?

x² + 5x +6

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x² +

x +7

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x² + 13x +12

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x² + 2x +3

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Solution

The correct option is B x² + x +7
All the co-efficients of a quadratic equation must be real

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Similar questions

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\frac{6 x^{2} + 13 x - 4}{2 x + 5} = \frac{12 x^{2} + 5 x - 2}{4 x + 3}

\frac{6 x^{2} + 13 x - 4}{2 x + 5} = \frac{12 x^{2} + 5 x - 2}{4 x + 3}

6 x^{2} - 13 x + 6 = 0

\sqrt{6} x^{2} - 5 x + \sqrt{6} = 0

24 x^{2} - 17 x + 3 = 0

x^{2} + 2 x + 4 = 0

x^{2} + x + 1 = 0

x^{2} - 3 \sqrt{3} x - 30 = 0

\frac{6 x^{2} - x - 2}{8 x^{2} + 6 x + 1} \times \frac{12 x^{2} - 13 x - 4}{12 x^{2} - 25 x + 12}

Factorise the given quadratic equation

$x^{2} + 5 x + 6 = 0.$

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