Class 10

Math

All topics

Quadratic Equations

Which of the following is not a quadratic equation?

- $2(x+1)_{2}=4x_{2}+2x+1$
- $2x+x_{2}=2x_{2}+5$
- $(2 ×3 x)_{2}+x_{2}=3x_{2}+5x$
- $(x_{2}+2x)_{2}=x_{5}+3+4x_{3}$

$2(x_{2}+2x+1)=4x_{2}+2x+1$

$2x_{2}+4x+2=4x_{2}+2x+1$

$2x_{2}+4x+2−4x_{2}−2x−1=0$

$−2x_{2}+2x+1=0$

is a quadratic equation

B. $2x+x_{2}=2x_{2}+5$

$−x_{2}+2x=5$

is a quadratic equation

C. $[2 x3 ]_{2}+x_{2}=3x_{2}+5x$

$(6x_{2})+x_{2}−3x_{2}−5x=0$

$4x_{2}−5x=0$

is a quadratic equation

D. $(x_{2}+2x)_{2}=x_{5}+4x_{3}+3$

As degree of $x$ is $5$, it is not quadratic.