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Which of the following is not a quadratic equation :

Question

Which of the following is not a quadratic equation :

(x - 2)^{2} + 1 = 2 x - 3

x (x + 1) + 8 = (x + 2) (x - 2)

x (2 x + 3) = x^{2} + 1

(x + 2)^{3} = x^{3} - 4

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Which of the following is not a quadratic equation :

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Text solutionVerified

x (x + 1) + 8 = (x + 2) (x - 2)

∴ x^{2} + x + 8 = x^{2} - 4

∴ x + 12 = 0

The highest power of

x

in this equation is

1

So, this is not a quadratic equation.

The answer is option (B)

(Note that, in option

D

(x + 2)^{3} = (x^{3} - 4)

also reduces to quadratic, since the

x^{3}

terms cancel out.)

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Question Text	Which of the following is not a quadratic equation :
Answer Type	Text solution:1
Upvotes	150