Which of the following is not a quadrati...

Which of the following is not a quadratic equation ?

`x^(2)+4x=11+x^(2)`

`x^(2)=4x`

`5x^(2)=90`

`2x-x^(2)-x^(2)+5`

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The correct Answer is:

`x^(2)+4x=11+x^(2)`

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Which of the following is not the quadratic equation whose roots are cosec^2thetaand sec^2theta ?

`x^2-6x+6=0`

`x^2-7x+7=0`

`x^2-4x+4=0`

None of these

`(x^(2)+1)=(2-x)^(2)+3`

`x^(3)-x^(2)=(x-1)^(3)`

`2x^(2)+3=(5+x)(2x-3)`

None of these

`x^(2) + 2x + 1 = (4 - x)^(2) +3 `

`- 2x^(2) = (5 - x) (2x- (2)/(5))`

`( k + 1) x^(2) + (3)/(2) x = 7` where k = -1

`x^(3) - x^(2) = (x -1)^(3)`