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Out of the following equations which one is nota quadratic equation ?

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Out of the following equations which one is nota quadratic equation ?
A. `x^(2) + 4x= 11+x^(2)`
B. `x^(2) = 4x`
C. `5x^(2) = 90 `
D. `2x^(2) -x^(2) =x^(2) +5`
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Correct Answer - A:B:C:D
`x^(2) + 4x = 11 + x^(2) :. 4x = 11`. This is not a quadratic equation.
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