Class 10

Math

All topics

Quadratic Equations

Which of the following is not a quadratic equation?

- $x_{2}+6y+2$
- $(x−2)+(x+2)_{2}+3$
- $(3x−2)_{3}+21 x−4$
- $3x_{2}−6x+21 $

Here, the only equation that has a third degree variable is $(3x−2)_{3}+21 x−4$ and all other equations have two degree variables.

So, $(3x−2)_{3}+21 x−4$ is not a quadratic equation.