Question

Which one is the quadratic equation ?
(A) 5/x-3=x2
(B) x(x+5)=2
(C) n-1=2n
(D) 1/x2(x+2)=x

Answer 1

Hi ,

Option ( B ) is correct

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If degree of an equation is 2 then it is

called quadratic equation .

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A ) 5/( x - 3 ) = x²

5 = x²( x - 3 )

5 = x³ - 3x

degree = 3

2) x( x + 5 ) = 2

x² + 5x = 2

degree = 2

Quadratic equation.

C ) n - 1 = 2n

-1 = n

degree = 1

Linear equation .

D ) 1/x² ( x + 2 ) = x

1/( x³ + 2x² ) = x

1 = x( x³ + 2x² )

1 = x⁴ + 2x³

degree = 4

I hope this helps you.

: )

Answer 2

Step-by-step explanation:

option number b is correct.