Class 10 Math All topics Quadratic Equations

Choose the correct answer and write the alphabet of it :

From the following equation, which one is the quadratic equation ?

From the following equation, which one is the quadratic equation ?

(a)

$x5 −3=x_{2}$

(b)

$x(x+5)=4$

(c)

$n−1=2n$

(d)

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

Correct answer: (b)

Solution: Option : [A]

$x5 −3=x_{2}$

$x5−3x =x_{2}$

$5−3x=x_{3}$

$x_{3}+3x−5=0$

$⇒$ This is not a quadratic equation.

Option : [B]

$x(x+5)=4$

$x_{2}+5x=4$

$x_{2}+5x−4=0$

$⇒$ This is a quadratic equation.

Option : [C]

$n−1=2n$

$⇒$ This is not a quadratic equation.

Option : [D]

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

$x+2=x_{3}$

$x_{3}−(x+2)=0$

$x_{3}−x−2=0$

$⇒$ This is not a quadratic equation.

$∴$ Answer is option $[B]$

Similar topics

introduction to trigonometry

functions

some applications of trigonometry

quadratic equations

polynomials

introduction to trigonometry

functions

some applications of trigonometry

quadratic equations

polynomials

Related Questions

Related Questions