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Question

Which of the following is/are not a quadratic equation?


A

x28x+5=0

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B

3x24=0

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C

2x=x2

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D

x+5=3

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Solution

The correct option is D

x+5=3


Standard form of a Quadratic Equation is ax2+bx+c=0,a0

(i)x28x+5=0 is in the standard form, so it is a quadratic equation.

(ii)3x24=0 is in the standard form, so it is a quadratic equation.

(iii)2x=x2x22x=0 is in the standard form, so it is a quadratic equation.

(iv)x+5=30x2+x+2=0 which is not a quadratic equation because the coefficient of x2 (a)=0.


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