Which of the following is a quadratic equatio | vedclass

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(A) quadratic equation in one variable is an equation of the form $ax^{2} + bx + c = 0$,where $a, b, c$ are real numbers and $a 
eq 0$.Option $A$: $3

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$3x^{2} + \sqrt{2}x - 7 = 0$

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(A) quadratic equation in one variable is an equation of the form $ax^{2} + bx + c = 0$,where $a, b, c$ are real numbers and $a 
eq 0$.Option $A$: $3x^{2} + \sqrt{2}x - 7 = 0$ is a quadratic equation in one variable $(x)$.Option $B$: $3x^{2} + 2y - 6 = 0$ has two variables ($x$ and $y$).Option $C$: $4x - y = 5$ is a linear equation in two variables.Option $D$: $5x^{3} - 1 = 2$ is a cubic equation in one variable.

Which of the following is a quadratic equation in one variable?

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