Class 10 Math All topics Quadratic Equations

Which of the following is a quadratic equation ?

(a)

$6x_{2}=20−x_{3}$

(b)

$x_{2}(x_{2}1 )$ = $27 $

(c)

$x3 $ $=4$ $x_{2}$

(d)

$5x_{2}+7=3x$

Correct answer: (d)

Solution: Part $(A)$

$6x_{2}=20−x_{3}$

$x_{3}+6x_{2}−20=0$

In this, the maximum power of $x$ is $3$.

So, it is not quadratic equation.

Part $(B)$

$x_{2}(x_{2}1 )=27 $

$1=27 $

So, it is not quadratic equation.

Part $(C)$

$x3 =4x_{2}$

$3=4x_{3}$

In this, the maximum power of $x$ is $3$.

So, it is not quadratic equation.

Part $(D)$

$5x_{2}+7=3x$

$5x_{2}−3x+7=0$

In this, the maximum power of $x$ is $2$.

So, it is quadratic equation.

Hence, this is the answer.

Similar topics

functions

introduction to trigonometry

some applications of trigonometry

quadratic equations

arithmetic progressions

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